Forcing a preferences update

Does anybody know how I would go about forcing preferences to be pushed out immediately from an OD server? For instance, on the Windows side, AD will force a group policy update every hour +/- a half hour. Can OD be set to update its policy (user/group/computer preferences) in such a way? Or is there any way to manually force it? Perhaps something I could even script on the client side to update every x-minutes? A restart of the MCX client, or something? Thanks very much for any help or ideas!