diff --git a/src/AS.c b/src/AS.c
index 6705f21..7046d39 100644
--- a/src/AS.c
+++ b/src/AS.c
@@ -54,3 +54,133 @@ ASAuthenticateRequest(ParseeConfig *data, HttpClientContext *ctx)
     HttpRequestHeader(ctx, "Authorization", bearer);
     Free(bearer);
 }
+bool
+ASRegisterUser(ParseeConfig *conf, char *user)
+{
+    HttpClientContext *ctx = NULL;
+    HashMap *json = NULL;
+    HttpStatus status;
+    if (!conf || !user)
+    {
+        return false;
+    }
+
+    /* Create user. We don't actually care about the value as we can 
+     * masquerade, as long as it exists. */
+    ctx = ParseeCreateRequest(
+        conf, 
+        HTTP_POST, "/_matrix/client/v3/register"
+    );
+    json = HashMapCreate();
+
+    HashMapSet(json,"type",JsonValueString("m.login.application_service"));
+    HashMapSet(json,"username",JsonValueString(user));
+
+    ASAuthenticateRequest(conf, ctx);
+    status = ParseeSetRequestJSON(ctx, json);
+    HttpClientContextFree(ctx);
+    JsonFree(json);
+
+    return status == HTTP_OK;
+}
+
+void
+ASPing(ParseeConfig *conf)
+{
+    HttpClientContext *ctx = NULL;
+    HashMap *json = NULL;
+    char *path;
+    if (!conf)
+    {
+        return;
+    }
+
+    Log(LOG_NOTICE, "Pinging...");
+    path = StrConcat(3,
+        "/_matrix/client/v1/appservice/",
+        "Parsee%20XMPP",
+        "/ping"
+    );
+    ctx = ParseeCreateRequest(
+        conf, 
+        HTTP_POST, path
+    );
+    Free(path);
+    json = HashMapCreate();
+    ASAuthenticateRequest(conf, ctx);
+    ParseeSetRequestJSON(ctx, json);
+    HttpClientContextFree(ctx);
+    JsonFree(json);
+}
+void
+ASJoin(ParseeConfig *conf, char *id, char *masquerade)
+{
+    HttpClientContext *ctx = NULL;
+    HashMap *json = NULL, *params_obj;
+    char *path, *params;
+    if (!conf || !id)
+    {
+        return;
+    }
+
+    params_obj = HashMapCreate();
+    if (masquerade)
+    {
+        HashMapSet(params_obj, "user_id", masquerade);
+    }
+    params = HttpParamEncode(params_obj);
+    HashMapFree(params_obj);
+    path = StrConcat(4, 
+        "/_matrix/client/v3/rooms/", id, "/join?",
+        params
+    );
+    Free(params);
+
+    ctx = ParseeCreateRequest(
+        conf, 
+        HTTP_POST, path
+    );
+    Free(path);
+    json = HashMapCreate();
+    ASAuthenticateRequest(conf, ctx);
+    ParseeSetRequestJSON(ctx, json);
+    HttpClientContextFree(ctx);
+    JsonFree(json);
+}
+void
+ASSend(ParseeConfig *conf, char *id, char *user, char *type, HashMap *c)
+{
+    HttpClientContext *ctx = NULL;
+    HashMap *json = NULL, *params_obj;
+    char *path, *params;
+    char *txn;
+    if (!conf || !id || !type || !c)
+    {
+        return;
+    }
+
+    txn = StrRandom(16);
+    params_obj = HashMapCreate();
+    if (user)
+    {
+        HashMapSet(params_obj, "user_id", user);
+    }
+    params = HttpParamEncode(params_obj);
+    HashMapFree(params_obj);
+    path = StrConcat(8, 
+        "/_matrix/client/v3/rooms/",
+        id, "/send/", type, "/", txn, "?",
+        params
+    );
+    Log(LOG_INFO, "Sending %s", path);
+    Free(params);
+    Free(txn);
+
+    ctx = ParseeCreateRequest(conf, HTTP_PUT, path);
+    Free(path);
+    json = HashMapCreate();
+    ASAuthenticateRequest(conf, ctx);
+    Log(LOG_INFO, "%d", ParseeSetRequestJSON(ctx, c));
+    HttpClientContextFree(ctx);
+    JsonFree(c);
+}
diff --git a/src/Events.c b/src/Events.c
new file mode 100644
index 0000000..9e4a620
--- /dev/null
+++ b/src/Events.c
@@ -0,0 +1,17 @@
+#include <Matrix.h>
+
+HashMap *
+MatrixCreateNotice(char *body)
+{
+    HashMap *map;
+    if (!body)
+    {
+        return NULL;
+    }
+
+    map = HashMapCreate();
+    HashMapSet(map, "msgtype", JsonValueString("m.notice"));
+    HashMapSet(map, "body", JsonValueString(body));
+
+    return map;
+}
diff --git a/src/Main.c b/src/Main.c
index 80e56cf..b7367db 100644
--- a/src/Main.c
+++ b/src/Main.c
@@ -4,6 +4,7 @@
 #include <string.h>
 
 #include <Parsee.h>
+#include <XML.h>
 #include <AS.h>
 
 int
@@ -12,7 +13,7 @@ Main(void)
     HttpServer *server = NULL;
     HttpServerConfig conf;
     ParseeData *data;
-    const ParseeConfig *parseeConf;
+    const ParseeConfig *parsee_conf;
     Stream *yaml;
 
     Log(LOG_INFO, "%s - v%s", NAME, VERSION);
@@ -23,29 +24,14 @@ Main(void)
     ParseeExportConfigYAML(yaml);
     StreamClose(yaml);
 
-    parseeConf = ParseeConfigGet();
-    Log(LOG_INFO, "HS token: %s", parseeConf->hs_token);
+    parsee_conf = ParseeConfigGet();
+    Log(LOG_INFO, "HS token: %s", parsee_conf->hs_token);
+    
+    ASRegisterUser(parsee_conf, parsee_conf->sender_localpart);
 
-    {
-        /* Create user. We don't actually care about the value as we can 
-         * masquerade, as long as it exists. */
-        HttpClientContext *ctx = ParseeCreateRequest(
-            parseeConf, 
-            HTTP_POST, "/_matrix/client/v3/register"
-        );
-        HashMap *json = HashMapCreate();
-
-        HashMapSet(json,"type",JsonValueString("m.login.application_service"));
-        HashMapSet(json,"username",JsonValueString(parseeConf->sender_localpart));
-
-        ASAuthenticateRequest(parseeConf, ctx);
-        Log(LOG_INFO, "Got %d", ParseeSetRequestJSON(ctx, json));
-        HttpClientContextFree(ctx);
-        JsonFree(json);
-    }
 
     memset(&conf, 0, sizeof(conf));
-    conf.port = parseeConf->port;
+    conf.port = parsee_conf->port;
     conf.threads = 4;
     conf.maxConnections = 32;
     conf.handlerArgs = ParseeInitData();
@@ -54,6 +40,8 @@ Main(void)
     /* TODO: The rest of Parsee. */
     server = HttpServerCreate(&conf);
     HttpServerStart(server);
+
+    /* TODO: Manage signals(^C) with finesse */
     HttpServerJoin(server);
 
     HttpServerFree(server);
diff --git a/src/MatrixEventHandler.c b/src/MatrixEventHandler.c
new file mode 100644
index 0000000..503872c
--- /dev/null
+++ b/src/MatrixEventHandler.c
@@ -0,0 +1,69 @@
+#include <Parsee.h>
+
+#include <Cytoplasm/Json.h>
+#include <Cytoplasm/Str.h>
+#include <Cytoplasm/Log.h>
+
+#include <Matrix.h>
+#include <AS.h>
+
+#define GrabString(obj, ...)    JsonValueAsString(JsonGet(obj, __VA_ARGS__))
+static void
+ParseeMemberHandler(const ParseeConfig *conf, HashMap *event)
+{
+    char *state_key = GrabString(event, 1, "state_key");
+    char *membership = GrabString(event, 2, "content", "membership");
+    char *room_id = GrabString(event, 1, "room_id");
+    Log(LOG_INFO, "Membership '%s'->'%s'", state_key, membership);
+    
+    if (StrEquals(membership, "invite") && ParseeIsPuppet(conf, state_key))
+    {
+        Log(LOG_INFO, "Looks like %s was invited to %s",
+            state_key,
+            GrabString(event, 1, "room_id")
+        );
+        ASJoin(conf, room_id, state_key);
+    }
+}
+static void
+ParseeMessageHandler(const ParseeConfig *conf, HashMap *event)
+{
+    char *msgtype = GrabString(event, 2, "content", "msgtype");
+    char *body = GrabString(event, 2, "content", "body");
+    char *id = GrabString(event, 1, "room_id");
+    if (StrEquals(body, "!help"))
+    {
+        Log(LOG_ERR, "Not implemented!");
+        ASSend(conf, id, NULL, "m.room.message",
+            MatrixCreateNotice("No help, pal.")
+        );
+    }
+}
+
+void
+ParseeEventHandler(const ParseeConfig *conf, HashMap *event)
+{
+    char *event_type;
+    if (!conf || !event)
+    {
+        return;
+    }
+
+    Log(LOG_INFO, "Event by '%s', with type '%s'",
+        JsonValueAsString(HashMapGet(event, "sender")),
+        JsonValueAsString(HashMapGet(event, "type"))
+    );
+
+    event_type = GrabString(event, 1, "type");
+    if (StrEquals(event_type, "m.room.member"))
+    {
+        ParseeMemberHandler(conf, event);        
+        return;
+    }
+    if (StrEquals(event_type, "m.room.message"))
+    {
+        ParseeMessageHandler(conf, event);        
+        return;
+    }
+}
+
diff --git a/src/ParseeUser.c b/src/ParseeUser.c
new file mode 100644
index 0000000..526ecef
--- /dev/null
+++ b/src/ParseeUser.c
@@ -0,0 +1,32 @@
+#include <Parsee.h>
+
+#include <string.h>
+
+bool
+ParseeIsPuppet(const ParseeConfig *conf, char *user)
+{
+    char *localpart;
+    bool flag = true;
+    size_t len;
+    if (!user || !conf || *user != '@')
+    {
+        return false;
+    }
+
+    localpart = user + 1;
+    len = strlen(conf->namespace_base);
+    if (strncmp(localpart, conf->namespace_base, len))
+    {
+        flag = false;
+    }
+
+    len = strlen(conf->sender_localpart);
+    if (!strncmp(localpart, conf->sender_localpart, len))
+    {
+        flag = true;
+    }
+
+    /* TODO: Check serverpart. 2 Parsee instances may be running in the same
+     * room. */
+    return flag;
+}
diff --git a/src/Routes/Ping.c b/src/Routes/Ping.c
new file mode 100644
index 0000000..88dc533
--- /dev/null
+++ b/src/Routes/Ping.c
@@ -0,0 +1,37 @@
+#include <Routes.h>
+
+#include <Cytoplasm/Log.h>
+
+#include <Matrix.h>
+#include <AS.h>
+
+RouteHead(RoutePing, arr, argp)
+{
+    ParseeHttpArg *args = argp;
+    HashMap *request = NULL;
+    HashMap *response = NULL;
+    
+    response = ASVerifyRequest(args);
+    if (response)
+    {
+        goto end;
+    }
+    if (HttpRequestMethodGet(args->ctx) != HTTP_POST)
+    {
+        HttpResponseStatus(args->ctx, HTTP_METHOD_NOT_ALLOWED);
+        response = MatrixCreateError(
+            "M_UNRECOGNIZED",
+            "Path /ping only accepts POST as a valid method."
+        );
+        goto end;
+    }
+    Log(LOG_INFO, "Pong!");
+
+    RequestJSON();
+
+    /* TODO: Load ping info */
+    response = HashMapCreate();
+end:
+    JsonFree(request);
+    return response;
+}
diff --git a/src/Routes/Root.c b/src/Routes/Root.c
index 1d47bdf..74fcecb 100644
--- a/src/Routes/Root.c
+++ b/src/Routes/Root.c
@@ -1,9 +1,13 @@
 #include <Routes.h>
 
+#include <AS.h>
+
 RouteHead(RouteRoot, arr, argp)
 {
     ParseeHttpArg *args = argp;
 
+    ASPing(args->data->config);
+
     HttpResponseHeader(args->ctx, "Content-Type", "text/html");
     HttpSendHeaders(args->ctx);
     StreamPrintf(args->stream, "<html lang=\"en\">");
diff --git a/src/Routes/Transactions.c b/src/Routes/Transactions.c
index 61524a5..182dba1 100644
--- a/src/Routes/Transactions.c
+++ b/src/Routes/Transactions.c
@@ -38,11 +38,11 @@ RouteHead(RouteTxns, arr, argp)
     for (i = 0; i < ArraySize(events); i++)
     {
         HashMap *event = JsonValueAsObject(ArrayGet(events, i));
-        Log(LOG_INFO, "Event by '%s', with type '%s'",
-            JsonValueAsString(HashMapGet(event, "sender")),
-            JsonValueAsString(HashMapGet(event, "type"))
-        );
+        ParseeEventHandler(args->data->config, event);
     }
+
+    /* TODO: Store TXN ID somewhere so that we can commit 
+     *             "Epic Matrix Idempotency"             */
     
     Log(LOG_INFO, "OK!");
     response = HashMapCreate();
diff --git a/src/XML/SAX.c b/src/XML/SAX.c
new file mode 100644
index 0000000..82c101c
--- /dev/null
+++ b/src/XML/SAX.c
@@ -0,0 +1,702 @@
+#include <XML.h>
+
+#include <Cytoplasm/HashMap.h>
+#include <Cytoplasm/Memory.h>
+#include <Cytoplasm/Array.h>
+#include <Cytoplasm/Str.h>
+#include <Cytoplasm/Log.h>
+
+#include <string.h>
+#include <ctype.h>
+
+struct XMLexer {
+    Stream *stream;
+    bool autofree;
+
+    /* A temporary buffer */
+    int *buffer;
+    ssize_t length;
+    ssize_t top;
+   
+    enum {
+        XML_STATE_NONE              = 0,
+        XML_STATE_COMMENT,
+
+        XML_STATE_ATTR,
+        XML_STATE_ATTRHEAD_PROP,
+        XML_STATE_ATTRTAIL
+    } state;
+
+    struct {
+        Array *elements;
+        char *str;
+    } data;
+};
+
+/* "Looks ahead" in the XML stream for a NUL-terminated string.
+ * If it was found and skip is set, then also skips over it. */
+static bool XMLookahead(XMLexer *lexer, const char *str, bool skip);
+
+/* Parses an XML "name" */
+static bool XMLIsStart(XMLexer *lexer);
+static char * XMLParseName(XMLexer *lexer);
+static bool XMLSkipSpace(XMLexer *lexer);
+static char * XMLParseAttValue(XMLexer *lexer);
+
+static ssize_t XMLInitialiseBuffer(XMLexer *lexer);
+static int XMLGetc(XMLexer *lexer);
+static void XMLUngetc(XMLexer *lexer, int ch);
+static void XMLEndBuffer(XMLexer *lexer);
+static void XMLRollback(XMLexer *lexer);
+static void XMLReset(XMLexer *lexer, ssize_t loc);
+static char * XMLStringify(XMLexer *lexer, ssize_t point);
+static HashMap * XMLReadProps(XMLexer *l);
+static void XMLPushElement(XMLexer *lexer, char *e);
+static char * XMLPopElement(XMLexer *lexer);
+
+static XMLEvent * XMLCreateEmptyElem(XMLexer *lexer, HashMap *attrs);
+static XMLEvent * XMLCreateStart(XMLexer *lexer, HashMap *attrs);
+static XMLEvent * XMLCreateRelax(XMLexer *lexer);
+static XMLEvent * XMLCreateEnd(XMLexer *lexer, char *end);
+static XMLEvent * XMLCreateData(XMLexer *lexer);
+
+XMLexer *
+XMLCreateLexer(Stream *stream, bool autofree)
+{
+    XMLexer *lexer;
+    if (!stream)
+    {
+        return NULL;
+    }
+
+    lexer = Malloc(sizeof(*lexer));
+    lexer->stream = stream;
+    lexer->autofree = autofree;
+    lexer->state = XML_STATE_NONE;
+    
+    lexer->buffer = NULL;
+    lexer->length = -1;
+    lexer->top = -1;
+
+    lexer->data.elements = ArrayCreate();
+    lexer->data.str = NULL;
+
+    return lexer;
+}
+void
+XMLFreeLexer(XMLexer *lexer)
+{
+    if (!lexer)
+    {
+        return;
+    }
+
+    if (lexer->autofree)
+    {
+        StreamClose(lexer->stream);
+    }
+    if (lexer->buffer)
+    {
+        Free(lexer->buffer);
+    }
+    if (lexer->data.str)
+    {
+        Free(lexer->data.str);
+    }
+    if (lexer->data.elements)
+    {
+        size_t i;
+        Array *elems = lexer->data.elements;
+        for (i = 0; i < ArraySize(elems); i++)
+        {
+            Free(ArrayGet(elems, i)); 
+        }
+        ArrayFree(lexer->data.elements);
+    }
+    Free(lexer);
+}
+
+
+XMLEvent *
+XMLCrank(XMLexer *lexer)
+{
+    XMLEvent *event = NULL;
+    char c;
+    char *attrname;
+    HashMap *props;
+    char *key, *val;
+    char cbuf[2] = { 0 };
+    char *tmp;
+    if (!lexer)
+    {
+        return NULL;
+    }
+    if (StreamEof(lexer->stream))
+    {
+        return NULL;
+    }
+    event = XMLCreateRelax(lexer);
+    switch (lexer->state)
+    {
+        case XML_STATE_NONE:
+            if (XMLookahead(lexer, "<!--", true))
+            {
+                if (lexer->data.str)
+                {
+                    XMLFreeEvent(event);
+                    event = XMLCreateData(lexer);
+                }
+
+                lexer->state = XML_STATE_COMMENT;
+                break;
+            }
+            else if (XMLookahead(lexer, "</", true))
+            {
+                if (lexer->data.str)
+                {
+                    XMLFreeEvent(event);
+                    event = XMLCreateData(lexer);
+                }
+
+                lexer->state = XML_STATE_ATTRTAIL;
+                break;
+            }
+            else if (XMLookahead(lexer, "<", true))
+            {
+                if (lexer->data.str)
+                {
+                    XMLFreeEvent(event);
+                    event = XMLCreateData(lexer);
+                }
+
+                lexer->state = XML_STATE_ATTR;
+                break;
+            }
+            /* TODO: Try storing character into str buffer. */
+            cbuf[0] = XMLGetc(lexer);
+            tmp = lexer->data.str;
+            lexer->data.str = StrConcat(2, tmp, cbuf);
+            Free(tmp);
+            break;
+        case XML_STATE_COMMENT:
+            if (XMLookahead(lexer, "-->", true))
+            {
+                lexer->state = XML_STATE_NONE;
+            }
+            else if (XMLookahead(lexer, "--", false))
+            {
+                /* Throw error */
+                return NULL;
+            }
+            break;
+        case XML_STATE_ATTR:
+            attrname = XMLParseName(lexer);
+            if (!attrname)
+            {
+                /* TODO: Throw error */
+            }
+            XMLPushElement(lexer, attrname);
+
+            props = XMLReadProps(lexer);
+
+            XMLSkipSpace(lexer);
+            if (XMLookahead(lexer, "/>", true))
+            {
+                lexer->state = XML_STATE_NONE;
+                XMLFreeEvent(event);
+                event = XMLCreateEmptyElem(lexer, props);
+
+                Free(XMLPopElement(lexer));
+                break;
+            }
+            else if (XMLookahead(lexer, ">", true))
+            {
+                lexer->state = XML_STATE_NONE;
+                XMLFreeEvent(event);
+                event = XMLCreateStart(lexer, props);
+                break;
+            }
+            break;
+        case XML_STATE_ATTRTAIL:
+            attrname = XMLParseName(lexer);
+            Free(XMLPopElement(lexer));
+            if (!XMLookahead(lexer, ">", true))
+            {
+                /* TODO: Throw error. */
+                break;
+            }
+            lexer->state = XML_STATE_NONE;
+            XMLFreeEvent(event);
+            event = XMLCreateEnd(lexer, attrname);
+            break;
+    }
+    /* TODO: Crank our XML parser. */
+    return event;
+}
+void
+XMLFreeEvent(XMLEvent *event)
+{
+    if (!event)
+    {
+        return;
+    }
+    if (event->element)
+    {
+        Free(event->element);
+    }
+    if (event->attrs)
+    {
+        char *key;
+        void *val;
+        while (HashMapIterate(event->attrs, &key, &val))
+        {
+            Log(LOG_INFO, "Trying to free %s", val);
+            Free(val);
+        }
+        HashMapFree(event->attrs);
+    }
+    if (event->data)
+    {
+        Free(event->data);
+    }
+    Free(event);
+}
+
+static bool
+XMLookahead(XMLexer *lexer, const char *str, bool skip)
+{
+    int *stack;
+    size_t top, i;
+    ssize_t ntop;
+    bool ret = false;
+    if (!lexer || !str)
+    {
+        return false;
+    }
+
+    top = 0;
+    stack = Malloc(strlen(str) * sizeof(*stack));
+    
+    for (i = 0; i < strlen(str); i++)
+    {
+        char c = str[i];
+        int getc = XMLGetc(lexer);
+
+        stack[top++] = getc;
+        if (getc != c || getc == EOF)
+        {
+            goto seekback;
+        }
+    }
+
+    /* We have been able to seek the string properly */
+    ret = true;
+    if (!skip)
+    {
+        goto seekback;
+    }
+    Free(stack);
+    return ret;
+
+seekback:
+    for (ntop = top - 1; ntop >= 0; ntop--)
+    {
+        XMLUngetc(lexer, stack[ntop]);
+    }
+    Free(stack);
+    return ret;
+}
+
+#define IsNamestart(c) ((c == ':') || isalpha(c) || (c == '_'))
+#define IsNamepart(c) (IsNamestart(c) || (c == '-') || isdigit(c))
+static char * 
+XMLParseName(XMLexer *lexer)
+{
+    int c;
+    ssize_t point;
+
+    point = XMLInitialiseBuffer(lexer);
+    c = XMLGetc(lexer);
+    if (!IsNamestart(c))
+    {
+        XMLRollback(lexer);
+        return NULL;
+    }
+
+    while ((c = XMLGetc(lexer)))
+    {
+        if (!IsNamepart(c))
+        {
+            break;
+        }
+    }
+    XMLUngetc(lexer, c);
+
+    return XMLStringify(lexer, point);
+}
+
+static ssize_t
+XMLInitialiseBuffer(XMLexer *lexer)
+{
+    if (!lexer)
+    {
+        return -1;
+    }
+    if (lexer->length != -1)
+    {
+        return lexer->top;
+    }
+
+    lexer->length = 0;
+    lexer->top = 0;
+    lexer->buffer = NULL;
+    return 0;
+}
+static int 
+XMLGetc(XMLexer *lexer)
+{
+    int ch;
+    if (lexer->length == -1)
+    {
+        return StreamGetc(lexer->stream);
+    }
+
+    ch = StreamGetc(lexer->stream);
+    if (lexer->top >= lexer->length)
+    {
+        lexer->length += 8;
+        lexer->buffer = Realloc(
+            lexer->buffer, 
+            lexer->length * sizeof(*lexer->buffer)
+        );
+    }
+    lexer->buffer[lexer->top++] = ch;
+    return ch;
+}
+static void 
+XMLUngetc(XMLexer *lexer, int ch)
+{
+    if (!lexer || lexer->length == -1)
+    {
+        StreamUngetc(lexer->stream, ch);
+        return;
+    }
+    if (lexer->top == 0)
+    {
+        return;
+    }
+
+    StreamUngetc(lexer->stream, ch);
+    lexer->top--;
+}
+static void 
+XMLEndBuffer(XMLexer *lexer)
+{
+    if (!lexer || lexer->length == -1)
+    {
+        return;
+    }
+    lexer->top = -1;
+    lexer->length = -1;
+
+    Free(lexer->buffer);
+    lexer->buffer = NULL;
+}
+static void 
+XMLRollback(XMLexer *lexer)
+{
+    ssize_t i;
+    if (!lexer || lexer->length == -1)
+    {
+        return;
+    }
+    for (i = lexer->top - 1; i >= 0; i--)
+    {
+        StreamUngetc(lexer->stream, lexer->buffer[i]);
+    }
+    XMLEndBuffer(lexer);
+}
+void
+XMLReset(XMLexer *lexer, ssize_t loc)
+{
+    ssize_t i;
+    if (!lexer || lexer->length == -1)
+    {
+        return;
+    }
+    for (i = lexer->top - 1; i >= loc; i--)
+    {
+        StreamUngetc(lexer->stream, lexer->buffer[i]);
+    }
+    lexer->top = loc;
+}
+char *
+XMLStringify(XMLexer *lexer, ssize_t point)
+{
+    ssize_t i;
+    char *str;
+    if (!lexer || lexer->length == -1)
+    {
+        return NULL;
+    }
+    str = Malloc(lexer->top + 1);
+    memset(str, '\0', lexer->top + 1);
+    for (i = point; i < lexer->top; i++)
+    {
+        str[i - point] = (char) lexer->buffer[i];
+    }
+    XMLEndBuffer(lexer);
+
+    return str;
+}
+
+#define IsSpace(c) ((c == ' ') || (c == 0x09) || (c == 0x0D) || (c == 0x0A))
+bool
+XMLSkipSpace(XMLexer *lexer)
+{
+    int c;
+    bool r = false;
+    while ((c = XMLGetc(lexer)) != EOF)
+    {
+        if (!IsSpace(c))
+        {
+            break;
+        }
+        r = true;
+    }
+    XMLUngetc(lexer, c);
+
+    return r;
+}
+HashMap *
+XMLReadProps(XMLexer *lexer)
+{
+    ssize_t point = XMLInitialiseBuffer(lexer);
+    HashMap *map = HashMapCreate();
+    bool error = false;
+    while (true)
+    {
+        char *name;
+        char *value = NULL;
+
+        if (!XMLSkipSpace(lexer))
+        {
+            /* A lack of space is totally excepted */
+            break;
+        }
+
+        name = XMLParseName(lexer);
+        if (!name)
+        {
+            /* A lack of name is totally excepted */
+            break;
+        }
+
+        value = StrDuplicate("");
+        if (XMLookahead(lexer, "=", true))
+        {
+            /* TODO: Values aren't names. */
+            Free(value);
+            value = XMLParseAttValue(lexer);
+            if (!value)
+            {
+                error = true;
+                Free(name);
+                break;
+            }
+        }
+        HashMapSet(map, name, value);
+        Free(name);
+    }
+    if (error)
+    {
+        XMLReset(lexer, point);
+    }
+    return map;
+}
+static XMLEvent * 
+XMLCreateStart(XMLexer *lexer, HashMap *attrs)
+{
+    XMLEvent *event = Malloc(sizeof(*event));
+    size_t elements = ArraySize(lexer->data.elements) - 1;
+    char *h_element = StrDuplicate(ArrayGet(lexer->data.elements, elements));
+
+    event->type = XML_LEXER_STARTELEM;
+    event->element = h_element;
+    event->attrs = attrs;
+    event->data = NULL;
+
+    /* TODO */
+    event->line = 0;
+    event->col = 0;
+    event->offset = 0;
+
+    return event;
+}
+XMLEvent *
+XMLCreateEnd(XMLexer *lexer, char *end)
+{
+    XMLEvent *event = Malloc(sizeof(*event));
+
+    event->type = XML_LEXER_ENDELEM;
+    event->element = end;
+    event->attrs = NULL;
+    event->data = NULL;
+
+    /* TODO */
+    event->line = 0;
+    event->col = 0;
+    event->offset = 0;
+
+    return event;
+}
+static XMLEvent *
+XMLCreateEmptyElem(XMLexer *lexer, HashMap *attrs)
+{
+    XMLEvent *event = Malloc(sizeof(*event));
+    size_t elements = ArraySize(lexer->data.elements) - 1;
+    char *h_element = StrDuplicate(ArrayGet(lexer->data.elements, elements));
+
+    event->type = XML_LEXER_ELEM;
+    event->element = h_element;
+    event->attrs = attrs;
+    event->data = NULL;
+
+    /* TODO */
+    event->line = 0;
+    event->col = 0;
+    event->offset = 0;
+
+    return event;
+}
+XMLEvent *
+XMLCreateData(XMLexer *lexer)
+{
+    XMLEvent *event = Malloc(sizeof(*event));
+    size_t elements = ArraySize(lexer->data.elements);
+
+    event->type = XML_LEXER_DATA;
+    event->element = elements ?
+        StrDuplicate(ArrayGet(lexer->data.elements, elements - 1)) :
+        NULL;
+    event->attrs = NULL;
+    event->data = lexer->data.str;
+
+    /* TODO */
+    event->line = 0;
+    event->col = 0;
+    event->offset = 0;
+
+    lexer->data.str = NULL;
+
+    return event;
+}
+static XMLEvent * 
+XMLCreateRelax(XMLexer *lexer)
+{
+    XMLEvent *event = Malloc(sizeof(*event));
+    size_t elements = ArraySize(lexer->data.elements);
+
+    event->type = XML_RELAX;
+    event->element = elements ?
+        StrDuplicate(ArrayGet(lexer->data.elements, elements - 1)) :
+        NULL;
+    event->attrs = NULL;
+    event->data = NULL;
+
+    /* TODO */
+    event->line = 0;
+    event->col = 0;
+    event->offset = 0;
+
+    return event;
+}
+
+static void 
+XMLPushElement(XMLexer *lexer, char *e)
+{
+    ArrayAdd(lexer->data.elements, e);
+}
+static char * 
+XMLPopElement(XMLexer *lexer)
+{
+    size_t n = ArraySize(lexer->data.elements);
+    if (n == 0)
+    {
+        return NULL;
+    }
+
+    return ArrayDelete(lexer->data.elements, n - 1);
+}
+
+#define IsNormalQ(c) ((c != '<') && (c != '&') && (c != '\''))
+#define IsNormalD(c) ((c != '<') && (c != '&') && (c != '"'))
+static char *
+XMLParseAttQuote(XMLexer *lexer)
+{
+    int c;
+    ssize_t point;
+    char *str;
+
+    point = XMLInitialiseBuffer(lexer);
+
+    while ((c = XMLGetc(lexer)))
+    {
+        if (!IsNormalQ(c))
+        {
+            break;
+        }
+    }
+    if (c != '\'')
+    {
+        XMLUngetc(lexer, c);
+        return NULL;
+    }
+
+    /* TODO: Decode the string */
+    str = XMLStringify(lexer, point);
+    str[strlen(str) - 1] = '\0'; /* Trim the quote. */
+    return str;
+}
+static char *
+XMLParseAttDouble(XMLexer *lexer)
+{
+    int c;
+    ssize_t point;
+    char *str;
+
+    point = XMLInitialiseBuffer(lexer);
+
+    while ((c = XMLGetc(lexer)))
+    {
+        if (!IsNormalD(c))
+        {
+            break;
+        }
+    }
+    if (c != '"')
+    {
+        XMLUngetc(lexer, c);
+        return NULL;
+    }
+
+    /* TODO: Decode the string */
+    str = XMLStringify(lexer, point);
+    str[strlen(str) - 1] = '\0'; /* Trim the quote. */
+    return str;
+}
+static char *
+XMLParseAttValue(XMLexer *lexer)
+{
+    ssize_t point = XMLInitialiseBuffer(lexer);
+
+    if (XMLookahead(lexer, "'", true))
+    {
+        return XMLParseAttQuote(lexer);
+    }
+    else if (XMLookahead(lexer, "\"", true))
+    {
+        return XMLParseAttDouble(lexer);
+    }
+    return NULL;
+}
diff --git a/src/include/AS.h b/src/include/AS.h
index 7c174ec..240d82e 100644
--- a/src/include/AS.h
+++ b/src/include/AS.h
@@ -15,4 +15,19 @@ extern HashMap * ASVerifyRequest(ParseeHttpArg *);
  * It does not send the request, however. */
 extern void ASAuthenticateRequest(ParseeConfig *, HttpClientContext *);
 
+/* Registers an user through the Application Service API. Returns 
+ * true if the user was created. */
+extern bool ASRegisterUser(ParseeConfig *, char *);
+
+/* Pings the homeserver to get attention. */
+extern void ASPing(ParseeConfig *);
+
+/* Joins a room from an ID and a given user we want to masquerade 
+ * as. */
+extern void ASJoin(ParseeConfig *, char *, char *);
+
+/* Sends a message event with a specific type and body.
+ * Said body is freed during the function's execution. */
+extern void ASSend(ParseeConfig *, char *, char *, char *, HashMap *);
+
 #endif
diff --git a/src/include/Matrix.h b/src/include/Matrix.h
index a0bef57..47943b8 100644
--- a/src/include/Matrix.h
+++ b/src/include/Matrix.h
@@ -5,4 +5,7 @@
 
 /* Creates an error message JSON, with the specified code and message. */
 extern HashMap * MatrixCreateError(char *err, char *msg);
+
+/* Creates the content for a notice message. */
+extern HashMap * MatrixCreateNotice(char *body);
 #endif
diff --git a/src/include/Parsee.h b/src/include/Parsee.h
index f025a33..71e9acf 100644
--- a/src/include/Parsee.h
+++ b/src/include/Parsee.h
@@ -52,4 +52,10 @@ extern HttpClientContext * ParseeCreateRequest(ParseeConfig *, HttpRequestMethod
 
 /* Sends headers, and writes the JSON object. */
 extern HttpStatus ParseeSetRequestJSON(HttpClientContext *, HashMap *);
+
+/* This function is called on every event received, and routes/manages it. */
+extern void ParseeEventHandler(const ParseeConfig *, HashMap *);
+
+/* Verifies if a user is a Parsee puppet user. */
+extern bool ParseeIsPuppet(const ParseeConfig *, char *);
 #endif
diff --git a/src/include/Routes.h b/src/include/Routes.h
index b07e5d7..ba8f223 100644
--- a/src/include/Routes.h
+++ b/src/include/Routes.h
@@ -10,7 +10,8 @@ typedef struct ParseeHttpArg {
 
 /* A list of all routes. */
 #define ROUTES      X_ROUTE("/", RouteRoot) \
-                    X_ROUTE("/_matrix/app/v1/transactions/(.*)", RouteTxns)
+                    X_ROUTE("/_matrix/app/v1/transactions/(.*)", RouteTxns) \
+                    X_ROUTE("/_matrix/app/v1/ping", RoutePing) 
 
 #define X_ROUTE(path, name)     extern void * name(Array *, void *);
     ROUTES
diff --git a/src/include/XML.h b/src/include/XML.h
new file mode 100644
index 0000000..608daf3
--- /dev/null
+++ b/src/include/XML.h
@@ -0,0 +1,36 @@
+#ifndef PARSEE_XML_H
+#define PARSEE_XML_H
+
+#include <Cytoplasm/HashMap.h>
+#include <Cytoplasm/Stream.h>
+
+typedef struct XMLexer XMLexer;
+typedef struct XMLEvent {
+    enum {
+        XML_LEXER_UNKNOWN       = 0,
+        XML_LEXER_STARTELEM,
+        XML_LEXER_ELEM,     /* Empty attr */
+        XML_LEXER_DATA,
+        XML_LEXER_ENDELEM,
+        
+        XML_RELAX
+    } type;
+
+    int line, col;
+    size_t offset;
+
+    /* The element name */
+    char *element;
+
+    /* Attributes hashmap */
+    HashMap *attrs;
+   
+    /* The decoded data */
+    char *data;
+} XMLEvent;
+
+extern XMLexer * XMLCreateLexer(Stream *, bool);
+extern XMLEvent * XMLCrank(XMLexer *);
+extern void XMLFreeEvent(XMLEvent *);
+extern void XMLFreeLexer(XMLexer *);
+#endif