I have Windows 95, Windows 98, and Windows NT 4 workstations in my department, which obviously dont have Kerberos. How do they participate with UWWI?
It depends on what type of participation you want. In general, Windows workstations of any modern flavor (NT or 9x) should be able to access shared resources that trust the UWWI, whether they are members of a domain that trusts UWWI or not. Access to these resources will require NTLMv2 or NTLMv1 authentication, which will require local administrators of Windows 9x machines to install the Active Directory Client and will require configuration for either NTLMv1 or NTLMv2 authentication. Both platforms can join a Windows domain for authentication. They will not, however, receive group policy from the domain.