Red Hat Linux Reference Guide 8.0.93
Page 32 (4.1.6. /etc/sysconfig/desktop)
This will be added next round.
The X chapter has information on selecting a prefered display manager (although
the updated X chpater was not in the beta).
It refers readers to /usr/share/doc/initscripts-<version-number>/sysconfig.txt
I added this for Taroon.
Thanks for the suggestion.