$domain.filter = "group","" would show only domain groups, global and local.

other filters...

"service","" would show the services.
"PrintQueue","" print queue's
"printjob",""
"FileShare",""
"Computer","" this would be NT/W2k/XP domain computers...i think

you can mix and match filters... "service","user" would display only services and users

Bryce