This should help you immensly.
Be VERY careful, opening these ports makes your internal hosts quite
vulnerable to SMB and NetBIOS-type attacks from the external network you are
connecting to.
How to Configure a Firewall for Windows NT and Trusts
Article ID: Q179442
http://support.microsoft.com/support/kb/articles/q179/4/42.asp?FR=0
WinNT, Terminal Server, & Exchange Services Use TCP/IP Ports
Article ID: Q150543
http://support.microsoft.com/support/kb/articles/q150/5/43.asp?FR=0
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