/DISPLAY

   /DISPLAY={"network-address" | logical-name | device-name}

   Specifies a network address, logical name, or device name that
   references the X server to which the proxy server should connect.
   A network address must be in the following form:

   "[transport/][node][:]:display[.screen]"

   This option is ignored for managed proxy servers.

   The default is /DISPLAY=DECW$DISPLAY.