How to record video games from your xbox 360 to pc?

i am trying to find out how to record video games you play on your xbox 360, ps3, wii, ps2 etc. And i am just wondering, what do u need to record video games on your game console. Cause i cant find a way to connect my game console onto my pc, so i can record while playing. Can anyone help me out with this problem? do i need anything in particular to record video games on my game console?