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Invoking XDM requires to be logged in as root
Typing XDM at the shell prompt when logged as standard user and running.
Openwin complains that it needs to be logged as root in order to run.
After Xact Install/Configuration, check carefully that you have added
$XACT/bin/sparc in your $PATH variable BEFORE /usr/openwin/bin
Otherwise, typing 'xdm' invokes Xwindows Display Manager, that actually can
be ran only when logged as root.