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By default DECwindows Motif on OpenVMS 7.3 seems to display in monochrome on my VAXstation 4000 model 60 (and, I presume, other VAXstation systems). The mouse pointer is drawn in colour (as it is white and black) but everything else is in a shade of green. This is obviously not very nice to look at.
To enable colour video output, copy SYS$MANAGER:DECW$PRIVATE_SERVER_SETUP.TEMPLATE to SYS$MANAGER:DECW$PRIVATE_SERVER_SETUP.COM and make the following change in the "Cluster Common or Standalone Workstation Setup" section:
$ ! decw$color == "F" $ decw$color == "T"
Then reboot the machine. When it has finished restarting it should come up with a big nasty red Compaq logo above the login window.
This is, of course, all stated in the manuals somewhere. Its just easier to find here.