--- /dev/null
+<?php
+// C = msg key
+// L = locking key
+$message_key = ftok(realpath(dirname(__FILE__)), "c");
+$locking_key = ftok(realpath(dirname(__FILE__)), "l");
+$store_key = ftok(realpath(dirname(__FILE__)), "s");
+
+echo "comms key: $message_key, $locking_key, $store_key\n";
+
+?>
\ No newline at end of file