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Microsoft Resource Kits - Windows 2003 Resource Kit

Ifmember.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
IfMember is a command-line tool that checks whether the current user is a member of a specified group. It is typically used in Windows logon scripts and other batch files. IfMember uses its own process token to discover group membership, rather than querying the relevant domain controller each time it runs. While this has a significant performance benefit, it does mean that IfMember will only be aware of groups on the local computer, on the computer's domain, and on trusted domains.