xev creates a window and then asks the X server to send it X11 events
whenever anything happens to the window (such as it being moved,
resized, typed in, clicked in, etc.). You can also attach it to an
existing window. It is useful for seeing what causes events to occur
and to display the information that they contain; it is essentially a
debugging and development tool, and should not be needed in normal
usage.
All questions regarding this software should be directed at the
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/app/xev
http://cgit.freedesktop.org/xorg/app/xev
For patch submission instructions, see:
http://www.x.org/wiki/Development/Documentation/SubmittingPatches
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage