jones@Serenity:~$ xwininfo

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x3e00013 "Steam Login"

  Absolute upper-left X:  623
  Absolute upper-left Y:  223
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 128
  Height: 66
  Depth: 24
  Visual: 0x233
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x3e00012 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +623+223  -615+223  -615-479  +623-479
  -geometry 128x66+623+223