They (I believe) create a DMO object and call ListAvailableServers to get a collection of the servers.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sqldmo/dmoref_m_l_9jfo.asp

Steve Jones

sjones@sqlservercentral.com

http://www.sqlservercentral.com/columnists/sjones

http://www.dkranch.net