When you are done using Cygwin/X, you can shutdown the X server by:
Selecting the "Exit..." option from the notification area icon menu
In Windowed mode: Press
Alt-F4 to
shutdown the X Server. This
can be disabled using the -nowinkill option.
In Windowed mode: Close the X server window in the conventional ways, e.g. by clicking on the "X" button at the upper-right corner of the X screen window frame, or choosing "Close" from the control menu opened by left-clicking on the X logo icon at the upper-left corner of the X screen window frame.
Using the -unixkill option allows the
Ctrl-Alt-Backspace
key combination to shutdown the X Server.
If clients are still connected to the X server, you will be prompted to confirm you wish to shutdown the X server.