Microsoft Knowledge Base Article 314953 contains the following summary:

This step-by-step article describes how to use Group Policy to deploy Windows XP Professional in a Windows 2000-based network. You can use Group Policy to make a Windows XP Professional upgrade available to the workstations in your network.

NOTE: To perform the procedures that are described in this article, you must be a member of the Administrators group on a computer that is running Windows 2000 Server or Advanced Server.