Red Alert 2:
Download and install Red Alert 2: http://xwis.net/downloads/Red-Alert-2-Multiplayer.exe
Log into your XWIS Game Account, add a RA2 serial and create a RA2 nick.
Start the game as administrator.
Click Internet.
Click Custom Match.
Enter XWIS nick and password.
Enjoy!
I bought the C&C Ultimate Collection. How do I add my serial number to my XWIS account?