void gtk_window_set_startup_id ( GtkWindow* window, const gchar* startup_id )
Startup notification identifiers are used by desktop environment to
track application startup, to provide user feedback and other
features. This function changes the corresponding property on the
underlying GdkWindow. Normally, startup identifier is managed
automatically and you should only use this function in special cases
like transferring focus from other processes. You should use this
function before calling
gtk_window_present() or any equivalent
function generating a window map event.
This function is only useful on X11, not with other GTK+ targets.