How to use Windows remote access (Windows XP or Windows Server 2003)
Normally, when multiple people need to have access to a Windows computer in a network, you need to use a server version of Windows (such as 2003) running Terminal Services.
However, you need to by licenses from Microsoft to do this. If you only need one person to access a computer remotely at a time, Windows allows you to do this without Terminal Services, in Windows XP as well as in Windows Server 2003.