VT100: Ctrl/Z or F10 VT200: Ctrl/Z or F10 DEFINE_KEY Function: EXIT Terminates the remote TELNET/TN3270 session. Aborts any exchange of data in progress between the local and remote hosts. Note that terminating a session with the IBM host in this way may result in improper termination of the session. For the appropriate logoff command string, see the user's guide for the IBM application with which you are communicating.