SEND NOP (No Operation) tells you whether your local host can
    send data to the remote host and the remote host can receive the
    data. If you:

    o  Get an %TELNET-E-INETERROR error message, there is a problem
       with the connection; the remote host is not able to receive
       data.

    o  Get an %TELNET-S-REMCLOSED status message, the connection with
       the remote host has been closed.

    o  Do not get an error message, the connection is active.

    DCL Format

      SEND NOP

    UNIX Format

      send nop