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.

This is the version of xev maintained by Xorg.

Homepage:
https://xorg.freedesktop.org/
