VMS Help TCPIP Services, TELNET, Suspending  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    While using TELNET, you can use the SPAWN command to suspend
    your current session and create a subprocess at the local DCL
    prompt. At the DCL prompt, you can then enter any number of DCL
    commands. To return to your suspended TELNET session (exiting the
    DCL subprocess), enter the LOGOUT command.

1 - Example

    In the following example, the user suspends the TELNET session
    to list the files in the working directory on the local host and
    deletes one of the files in that directory.

    TELNET> SPAWN
    $ DIR
       .
       .
       .
    $ DEL TR3.TXT:*