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Microsoft Resource Kits - Windows 2000 Resource Kit

Whoami.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Whoami.exe
This command-line tool returns the domain or computer name and the user name of the user who is currently logged onto the computer on which the tool is run. WhoAmI displays the complete contents of the access token (for example, of the current user's security context) on standard output (STDOUT). It displays the user name and security identifier (SID), the groups and their SIDs, the privileges and their status (for example, enabled or disabled) and the logon ID.