WINDOWS 2000 SERVER
In Windows 2000 Server, domains in a forest automatically exist in a transitive, two-way trust. For example, if domain A trusts B, and B trusts C, then A trusts C.
In addition, all root domains in a domain tree have a transitive two-way trust with the forest root domain. Ultimately, this means that all domains in the forest have a trust relationship with the other domains in the forest.
You can create two additional explicit trust relationships: external trusts and shortcut trusts. An external trust creates a relationship to a domain outside of the forest, such as a Windows NT domain. External trusts are one-way and nontransitive.
You can also create shortcut trusts, which are two-way, transitive trusts between domains in the same forest. Shortcut trusts shorten the trust path between two domains to improve performance and optimize authentication.
a new trust relationship, follow these steps:
the domain, and select Properties.
4. In the resulting dialog box, specify the remote domain and a password for the trust, and click OK.