XP pro and Vista flavors other than home allow for remote access via RDP. In many cases this a good option for working remotely. A remote session to a XP or Vista workstation does have a few slight differences compared to operating the computer directly. One big one is that you don't have the same options for shuting down on the start menu.
A frequent question I get is, how can I reboot a machine via RDP?
This is actually pretty simple. A Ctrl + Alt + End functions the same in a remote session as a Ctrl + Alt + Delete does on a local session. For an XP Domain member this brings up the "windows security" window, and for a XP stand alone you will get the task manager. From there you can choose shutdown, and then reboot.