Use the OFF command to log off the system.  When you log off you will
be given an opportunity to leave feedback for the sysop.  Then you will be
asked:

Set new items to old? (Y/N)

If you select Yes, then messages and files that were new for this call will
be considered old for your next call.  If you select No, then messages and
files that were new for this call will remain new for the next call.
