To log out of a Unix session, type exit

If you cannot quit an application there are two ways that will generally allow you to get out of an application. ^c (pushing the control key and the lower case c key at the same time) will kill most applications. ^z will suspend most applications. The suspended application can then be put in the background (where it will still be running - you just won't see it) by typing bg. You can later bring the application back to the foreground, where you can again see it, by typing fg. You must kill all background applications before logging out. One way to do this is to use the fg command and exit from the application. Another is to use the ps command and the kill command. See "Using Unix" for more information on how to do this.