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

    Use the REXEC feature to send a command to execute on a remote
    host that does not have, or might not have, the authentication
    information that RSH requires. The remote system's authentication
    files are not used.

    Along with the remote command, REXEC sends the password you
    specify on the command line to the remote host. This password
    is used for security checking.

    The Remote Shell program invokes REXEC. To use REXEC, enter
    RSH /PASSWORD.

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