diff --git a/src/server/tabletennis.h b/src/server/tabletennis.h
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+++ b/src/server/tabletennis.h
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+/*
+ * Copyright 2010 Nathan Phillip Brink
+ *
+ * This file is a part of DistRen.
+ *
+ * DistRen is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DistRen is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with DistRen.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _DISTREN_TABLETENNIS_H
+#define _DISTREN_TABLETENNIS_H
+
+/**
+ * @file For managing the PINGs and PONGs of our present life.
+ *
+ * Do not call ping pong ping pong! Any professional ping-ponger will
+ * be immediately offended. Use tabletennis instead and prosper.
+ */
+
+#include "distrend.h"
+
+#include <queue.h>
+#include <time.h>
+
+struct tabletennis;
+typedef struct tabletennis *tabletennis_t;
+
+/**
+ * this struct should be embedded into struct distrend_client
+ */
+struct tabletennis_client
+{
+  /*
+   * the time that the client should be processed from the
+   * clients_to_ping or clients_need_pong queues.
+   */
+  time_t time_next_check;
+
+  enum tabletennis_client_state
+    {
+      /* in clients_to_ping */
+      TABLETENNIS_NEED_PING,
+      /* in clients_need_pong */
+      TABLETENNIS_NEED_PONG,
+      TABLETENNIS_HAS_PONG,
+      /* not in any queue */
+      TABLETENNIS_DELINQUENT,
+    } state;
+};
+
+/**
+ * Initializes the context data for tabletennis.
+ *
+ * @param listens to register tabletennis's PING and PONG handlers
+ * @param ping_interval The number of seconds to wait before sending a client a PING packet.
+ * @param pong_time The number of seconds to wait before checking if a client sent a PONG packet.
+ */
+tabletennis_t tabletennis_new(struct distrend_listens *listens, unsigned int ping_interval, unsigned int pong_time);
+
+/**
+ * Add a client to the tabletennis game.
+ *
+ * @param tabletennis the tabletennis context.
+ * @param client the client
+ */
+int tabletennis_add_client(tabletennis_t tabletennis, struct distrend_client *client);
+
+/**
+ * Sends PING packets to clients that need them and checks that
+ * clients have sent PONG packets on time.
+ *
+ * @param clients_to_ping a queue initialized
+ */
+int tabletennis_serve(tabletennis_t tabletennis);
+
+/**
+ * Remove a client to the tabletennis game.
+ *
+ * @param tabletennis the tabletennis context.
+ * @param client the client
+ */
+int tabletennis_del_client(tabletennis_t tabletennis, struct distrend_client *client);
+
+/**
+ * Deallocates and frees the tabletennis context data.
+ *
+ * Does not free the distren_client structs
+ *
+ * @param tabletennis the tabletennis context.
+ */
+void tabletennis_free(tabletennis_t tabletennis);
+
+#endif