void wm_subwindows_free(wmWindow *win);
int wm_subwindow_open(wmWindow *win, rcti *winrct);
-void wm_subwindow_set(wmWindow *win, int swinid); /* set drawable */
void wm_subwindow_close(wmWindow *win, int swinid);
int wm_subwindow_get(wmWindow *win); /* returns id */