+/**
+ * Queue a request from a client for transmission to a particular peer.
+ *
+ * @param car request to queue; this handle is then shared between
+ * the caller (CLIENTS subsystem) and SESSIONS and must not
+ * be released by either until either 'GNUNET_SESSIONS_dequeue',
+ * or 'GNUNET_CLIENTS_failed'
+ * have been invoked on it
+ */
+void
+GSC_SESSIONS_queue_request (struct GSC_ClientActiveRequest *car);
+
+
+/**
+ * Dequeue a request from a client from transmission to a particular peer.
+ *
+ * @param car request to dequeue; this handle will then be 'owned' by
+ * the caller (CLIENTS sysbsystem)
+ */
+void
+GSC_SESSIONS_dequeue_request (struct GSC_ClientActiveRequest *car);
+
+
+/**
+ * Transmit a message to a particular peer.
+ *
+ * @param car original request that was queued and then solicited,
+ * ownership does not change (dequeue will be called soon).
+ * @param msg message to transmit
+ * @param cork is corking allowed?
+ */
+void
+GSC_SESSIONS_transmit (struct GSC_ClientActiveRequest *car,
+ const struct GNUNET_MessageHeader *msg, int cork);
+
+
+/**
+ * Broadcast a message to all neighbours.
+ *
+ * @param msg message to transmit
+ */
+void
+GSC_SESSIONS_broadcast (const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * We have a new client, notify it about all current sessions.
+ *
+ * @param client the new client
+ */
+void
+GSC_SESSIONS_notify_client_about_sessions (struct GSC_Client *client);
+
+/**
+ * We've received a typemap message from a peer, update ours.
+ * Notifies clients about the session.
+ *
+ * @param peer peer this is about
+ * @param msg typemap update message
+ */
+void
+GSC_SESSIONS_set_typemap (const struct GNUNET_PeerIdentity *peer,
+ const struct GNUNET_MessageHeader *msg);
+
+
+/**
+ * The given peer send a message of the specified type. Make sure the
+ * respective bit is set in its type-map and that clients are notified
+ * about the session.
+ *
+ * @param peer peer this is about
+ * @param type type of the message
+ */
+void
+GSC_SESSIONS_add_to_typemap (const struct GNUNET_PeerIdentity *peer,
+ uint16_t type);
+
+
+/**
+ * Handle CORE_ITERATE_PEERS request. For this request type, the client
+ * does not have to have transmitted an INIT request. All current peers
+ * are returned, regardless of which message types they accept.
+ *
+ * @param cls unused
+ * @param client client sending the iteration request
+ * @param message iteration request message
+ */
+void
+GSC_SESSIONS_handle_client_iterate_peers (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader
+ *message);
+
+
+/**
+ * Handle CORE_PEER_CONNECTED request. Notify client about connection
+ * to the given neighbour. For this request type, the client does not
+ * have to have transmitted an INIT request. All current peers are
+ * returned, regardless of which message types they accept.
+ *
+ * @param cls unused
+ * @param client client sending the iteration request
+ * @param message iteration request message
+ */
+void
+GSC_SESSIONS_handle_client_have_peer (void *cls,
+ struct GNUNET_SERVER_Client *client,
+ const struct GNUNET_MessageHeader
+ *message);
+
+
+