#!/usr/bin/env python
from gtk.gdk import *
for id in get_default_root_window().property_get('_NET_CLIENT_LIST')[2]:
    w = window_foreign_new(id)
    state = w.property_get("_NET_WM_STATE")[2]
    maximized = '_NET_WM_STATE_MAXIMIZED_HORZ' in state and '_NET_WM_STATE_MAXIMIZED_VERT' in state
    if maximized: w.unmaximize()
    w.set_decorations(0)
window_process_all_updates()