Au Agent 2.0 for Windows NT2000 Description:

Have got tired from logon
sessions switching, every time you need to run an application in context of
another user? Now it's easy! Au Agent allows you to do it, only by one mouse
click! Extends Windows NT Explorer by integrating into context menus.
Automatically sets environment variables, loads profiles of the users and
user keys of the system registry. Supports Windows NT desktops.