Logging into multiple domains

We have several mobile users. When they are at Headquarters, they are part of the ‘HQ’ domain. Most of them use docking stations.

When they are on the road, they access other networks. Most of these networks are customer networks and they have created computer accounts for our mobile users.

To gain access to our customers’ resources, these users have to join the customers’ domains.

Is there a way for Win2K Professional to automatically detect what domains are available on a network and allow you to attempt to log into those domains?