The following steps define how to join a server running the Windows 2000 Server platform to a domain.
On the ISA Server 2004 computer, click Start, right-click My Computer, and then click Properties.
Click the Computer Name tab and click Change.
Click Domain, type in your domain name, and click OK.
When presented with an authentication dialog box, provide an account and password with Domain Admin privileges to join the server to the domain. You have to reboot the server to complete joining the domain.
For more detailed step-by-step explanations of server administration, check out the Microsoft Windows 2000 Administrator's Pocket Consultant or the Microsoft Windows Server 2003 Administrator's Pocket Consultant, both Microsoft Press books authored by William R. Stanek.