xkill is a utility for forcing the X server to close connections to
clients.  This program is very dangerous, but is useful for aborting
programs that have displayed undesired windows on a user's screen.

All questions regarding this software should be directed at the
Xorg mailing list:

  https://lists.x.org/mailman/listinfo/xorg

The master development code repository can be found at:

  https://gitlab.freedesktop.org/xorg/app/xkill

Please submit bug reports and requests to merge patches there.

For patch submission instructions, see:

  https://www.x.org/wiki/Development/Documentation/SubmittingPatches