TELNET supports:
    o  Multiple simultaneous connections
    o  10 or more simultaneous sessions
    o  Only one session at a time if it uses TN3270
    The TELNET command SHOW STATUS helps you keep track of multiple
    sessions.
    o  Toggling Sessions
       To toggle between one open TELNET connection and another:
       1. Enter the TELNET escape sequence.
       2. If necessary, use the SHOW STATUS command to check the
          number of your session with the other host.
       3. Enter the TELNET RESUME n command, where n is the number of
          the session to which you want to return.
    o  Session Information
       To display a list of your active sessions, use the following
       SHOW SESSION command:
       TELNET> SHOW SESSION <Return>
       Session 01, host finder, port 23
       Session 02, host keeper, port 23 (default active session)
       If there are no active connections, the SHOW SESSION command
       displays the following message:
       %TELNET-E-NOSESSION, No active session