Implemented registry change notifications.

diff --git a/server/object.h b/server/object.h
index d2f57bc..711f584 100644
--- a/server/object.h
+++ b/server/object.h
@@ -195,6 +195,7 @@
 extern void init_registry(void);
 extern void flush_registry(void);
 extern void close_registry(void);
+extern void registry_close_handle( struct object *obj, obj_handle_t hkey );
 
 /* atom functions */