If you cannot get the WinXP Remote Desktop working, consider using VNC. It has servers and clients for both Windows and Linux and it is GPL software.
http://www.realvnc.com/I think that RH9 has a client for it, but I am not sure if it is installed by default.
Simply install VNC on the WinXP system and start the VNC service in the WinXP service manager. The first time you run it, VNC will prompt you for a password to use for the connection. Enter your desired password and it will run from there.
You can then go to the VNC Client on your RH9 box, enter the hostname/IP Address of your WinXP system, enter the password you entered above and viola, complete control of your WinXP system from your RH box.
Hope this Helps