void grab_startup();
void grab_shutdown();
-void grab_keyboard(gboolean grab);
+int grab_keyboard(gboolean grab);
void grab_pointer(gboolean grab, Cursor cur);
+void grab_pointer_window(gboolean grab, Cursor cur, Window win);
void grab_server(gboolean grab);
void grab_button(guint button, guint state, Window win, guint mask,