Instructions
Press the "F10" key to open the in-game console while playing "Unreal Tournament 3."
Type "setbind key command" at the console, replacing "key" with the name of the key you want to bind, and "command" with the command you want to bind to it. For example, type "setbind Y shot" to bind the screenshot command to the "Y" key, or "setbind I showhud" to bind the command that hides the game's interface to the "I" key.
Press "Enter" to run the setbind command and press "F10" to hide the console.