kadir@uwork:~$ wmctrl -xl
0x03600002  0 N/A                   uwork XdndCollectionWindowImp
0x03600005  0 N/A                   uwork unity-launcher
0x0300000a  0 desktop_window.Nautilus  uwork Desktop
0x03600008  0 N/A                   uwork unity-panel
0x0360000b  0 N/A                   uwork unity-dash
0x0360000c  0 N/A                   uwork Hud
0x0440908c  0 Navigator.Firefox     uwork unity - Key combination to switch between an application's windows in all of viewports - Ask Ubuntu - Mozilla Firefox
0x03e0001b  0 yakuake.Yakuake       uwork Yakuake