Vedo questo (è la prima volta che uso il comando...)

alberto@alberto-laptop:~$ xev
Outer window is 0x3e00001, inner window is 0x3e00002

PropertyNotify event, serial 8, synthetic NO, window 0x3e00001,
atom 0x27 (WM_NAME), time 5055993, state PropertyNewValue

PropertyNotify event, serial 9, synthetic NO, window 0x3e00001,
atom 0x22 (WM_COMMAND), time 5055993, state PropertyNewValue

PropertyNotify event, serial 10, synthetic NO, window 0x3e00001,
atom 0x28 (WM_NORMAL_HINTS), time 5055993, state PropertyNewValue

CreateNotify event, serial 11, synthetic NO, window 0x3e00001,
parent 0x3e00001, window 0x3e00002, (10,10), width 50, height 50
border_width 4, override NO

PropertyNotify event, serial 12, synthetic NO, window 0x3e00001,
atom 0x19b (_NET_WM_ALLOWED_ACTIONS), time 5055994, state PropertyNewValue

PropertyNotify event, serial 14, synthetic NO, window 0x3e00001,
atom 0x13c (WM_PROTOCOLS), time 5055994, state PropertyNewValue

MapNotify event, serial 15, synthetic NO, window 0x3e00001,
event 0x3e00001, window 0x3e00002, override NO

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x1a1 (_NET_FRAME_WINDOW), time 5055995, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x19b (_NET_WM_ALLOWED_ACTIONS), time 5055995, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x141 (_NET_FRAME_EXTENTS), time 5055995, state PropertyNewValue

ConfigureNotify event, serial 18, synthetic NO, window 0x3e00001,
event 0x3e00001, window 0x3e00001, (1,51), width 178, height 178,
border_width 2, above 0x1a06d1f, override NO

ConfigureNotify event, serial 18, synthetic NO, window 0x3e00001,
event 0x3e00001, window 0x3e00001, (661,51), width 178, height 178,
border_width 2, above 0x1a06d1f, override NO

ConfigureNotify event, serial 18, synthetic NO, window 0x3e00001,
event 0x3e00001, window 0x3e00001, (661,51), width 178, height 178,
border_width 2, above 0x3c00004, override NO

MapNotify event, serial 18, synthetic NO, window 0x3e00001,
event 0x3e00001, window 0x3e00001, override NO

VisibilityNotify event, serial 18, synthetic NO, window 0x3e00001,
state VisibilityUnobscured

Expose event, serial 18, synthetic NO, window 0x3e00001,
(0,0), width 178, height 10, count 3

Expose event, serial 18, synthetic NO, window 0x3e00001,
(0,10), width 10, height 58, count 2

Expose event, serial 18, synthetic NO, window 0x3e00001,
(68,10), width 110, height 58, count 1

Expose event, serial 18, synthetic NO, window 0x3e00001,
(0,68), width 178, height 110, count 0

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x14a (_NET_WM_STATE), time 5055997, state PropertyNewValue

FocusIn event, serial 18, synthetic NO, window 0x3e00001,
mode NotifyNormal, detail NotifyNonlinear

KeymapNotify event, serial 18, synthetic NO, window 0x0,
keys: 126 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x144 (_NET_WM_DESKTOP), time 5055997, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x130 (WM_STATE), time 5055999, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x131 (XKLAVIER_STATE), time 5056004, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x1cc (_COMPIZ_WINDOW_DECOR), time 5056051, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x1d2 (_COMPIZ_WM_WINDOW_BLUR_DECOR), time 5056051, state PropertyNewValue

PropertyNotify event, serial 18, synthetic NO, window 0x3e00001,
atom 0x19e (_NET_WM_ICON_GEOMETRY), time 5056052, state PropertyNewValue

FocusOut event, serial 33, synthetic NO, window 0x3e00001,
mode NotifyNormal, detail NotifyNonlinear