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

    Sends a command line to a specified remote host for execution.

    The difference between the REXEC facility and RSH is security
    checking:

    o  REXEC - The remote host bases authentication on user name and
       password.

    o  RSH - The remote host bases authentication on user name and
       information in the remote system's authentication files.

    To invoke the REXEC feature, enter one of the following:

    RSH /PASSWORD=password

    or

    RSH /PASSWORD