/sys$common/syshlp/helplib.hlb SET, DISPLAY, Qualifiers, /CREATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Creates the workstation display device (WSAn:) on which a
    DECwindows application is displayed. You must specify the /CREATE
    qualifier the first time you use the SET DISPLAY command, but
    you need not respecify it if you continue to redirect output from
    applications to other workstations with subsequent SET DISPLAY
    commands.

    When you specify the /CREATE qualifier without the /NODE
    qualifier, the workstation device defaults to the current node.
    Additionally, if you omit the /TRANSPORT qualifier, the transport
    defaults to either the value specified by the DECW$SETDISPLAY_
    DEFAULT_TRANSPORT logical, if defined, or to DECNET.