Its a command in udk i believe that switches the way the game is rendered. I can pressing f8 in the main menu and it lets me alternate but once in game it wont let me change it back so i could see the whole map in wire frame and effectively see through walls. Other modes showed different things but wireframe could be sort of abused if somebody wanted to put up with it.
i72600k
GTX 560
8gb ram
1tb hdd
windows 7 home premium