If you forget, you can place a running process in the
background. First suspend the process with CTRL-z, and then place it in
the background with the bg command.
If you use a program often, your window manager will generally provide a
way to put that program on a convenient graphical menu.
Troubleshooting
Sometimes when you launch an X client from a graphical menu, you won't be
able to see any error messages if it fails. You can find any error
messages in the file ~/.xsession-errors.
Leaving the X Environment
To leave X, you need to use a menu. Unfortunately for beginners, this is
different for every window manager, and for most window managers, it can
be configured in many ways. If there's an obvious menu, look for an entry
like ``Exit'' or ``Close Window Manager.'' If you don't see a menu, try
clicking each of the mouse buttons on the background of the screen. If all
else fails, you can forcibly kill the X server by pressing
CTRL-ALT-Backspace. Forcibly killing the server destroys any unsaved data
in open applications.
Customizing Your X Startup
When you start X, Debian runs some shell scripts that start your window
manager and other X clients.
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