Making a passthru service using a VMS system should be simple.  The
    harder part is to still allow LAT connection.
    We would suggest:
    - Use the autologin facility (See SYSMAN HELP ALF). Make all possible
      LAT port autologin into a special "passthru" account.
    - Create the "passthru" account as captive, no password.  Create its
      login procedure, and in the procedure ask for the destination and
      then TELNET to it.  Logoff after the TELNET.
    - Create a LAT service named TELNET and make it go to that system.
    The only problem is if users still want to use LAT to that system, now
    they can't or their port needs to be removed from the SYSALF.DAT file.
    Alternativelly, if they want access to the system providing the
    passthrough service, they can type localhost at the TELNET destination
    prompt, it is not resource friendly but it will work.