there is a text config file in which you can change it (or is that just with web RDC client?? note to self!)
but has to be a TSE 2003 cos on 2000 you can't change the port number (2nd note to self - you sure on that??)
disproved my second statement here:
1. Go to Start | Run.
2. Enter Regedt32.exe, and click OK.
3. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp.
4. Open the PortNumber subkey, and click the Decimal option.
5. Enter the port you want to use for the server (such as 3390), and click OK.
6. Close the Registry Editor, and open the Terminal Services Manager from the Administrative Tools folder.
7. Verify that there are no current connections to the server.
8. Right-click the RDP-Tcp branch, and choose Reset.
9. Test the connection from your RDC client: Enter the IP address of the server, followed by a colon and the port number, such as 192.168.1.10:3390.
Aftertaf
We shall prevail, and they shall not