Instructions
Turn off the Xboxes.
Insert a system link cable or an Ethernet cable into the appropriate jack on the Xboxes. Both connections are in the back of the Xbox.
Connect the Xboxes to separate monitors using the Xboxes RCA connectors. The jack for the connection is on the back of the Xbox. Match the cable color to the color of the jack, so red connects to red, white to white and yellow to yellow.
Turn on the Xboxes. The screen will display a menu of instructions to complete the process.