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

    To use a remote command on your OpenVMS system, remote hosts need
    to know the user name that you want to use on the host. You can
    provide the user name in either of two ways:

    o  Automatically: You do not need to take any action if your
       user name is the same on the remote host as it is on the local
       host. The remote commands automatically supply your local user
       name as the requested user name on the remote system.

    o  Using the /USER_NAME qualifier: Specify the user name with the
       /USER_NAME qualifier if your user name is:

       -  Different on the remote host

       -  In mixed case (only for remote hosts supporting case-
          sensitive user names)

       -  The same on the remote host but you want to access the
          remote host using another user name

       By default, the R commands send all user names in lowercase
       letters. If you access a host that supports case-sensitive
       user names, and the user name you specify has uppercase
       letters, you may use the /NOLOWERCASE qualifier to maintain
       these letters as uppercase, or you can specify the /USER_NAME
       qualifier with the user name within quotes.

    The remote host must also know your password or know you
    as a trusted user on your local system through a proxy or
    authentication:

    o  Accessing remote hosts by providing your password:

       -  Certain systems have case-sensitive passwords. To send your
          lowercase or mixed-case password to these hosts, enclose it
          within quotation marks ( " " ).

       -  On systems that are not case sensitive, you do not need to
          enclose your password within quotation marks ( " " ).

       -  You can specify the password on the command line:

          $ RSH WOODS /PASSWORD="Downy" LS

          Or, you can specify the password when the remote system
          prompts:

          $ RSH WOODS /PASSWORD DIR
          REXEC password:        (password not echoed)

    o  Accessing remote hosts as a trusted user:

       Most systems use certain authentication files or proxy
       accounts that allow trusted users on trusted hosts to access
       the system by specifying only the user name they want to
       use. To access a host without specifying the corresponding
       password, your originating host and user name must have an
       entry in these authentication files.

       The authentication file entries contain your originating user
       name. The R commands convert your originating user name to
       lowercase unless you use the /NOLOWERCASE qualifier. You may
       have to contact the system manager of the remote system to
       determine if the system is case-sensitive and, if so, what
       case is used in the authentication files.

                                  NOTES

       o  To use the REXEC feature, you must always use the
          /PASSWORD qualifier.

       o  The RLOGIN command does not recognize the /PASSWORD
          qualifier. If you are a trusted user, you are
          automatically logged in to the remote system.

       o  If you are not a trusted user, the remote host (REXEC)
          prompts you to enter a user name and password on the
          remote system.