Thijs Oppermann writes: [...] > I've found how to get the PID of a window: > > (xlib:get-property window :_NET_WM_PID)) > > > So this wil enable me to filter on PID I hope. I'll get back to the list once I > have my system working... ;) > Ok, nice. It seems I've completely miss the point... Your feedback is very welcome. Philippe