you don't use the Intel for a specific purpose. if you collect half of the Intel in the game you will get an achievement. if you collect all of the Intel you get another achievement.
Yes,but there is no split screen like the Xbox 360. You can only use Online.
simply, yes... you can play COD 4 with any gamepad...
No you need XBOX 360 controllers.
The original Xbox controller doesn't work on the 360.
Yes you can.
you don't need too, you can use xbox games on xbox 360
Any version of MW3 is compatible with the COD Elite program. It doesn't matter if you use Xbox 360, PS3, or PC.
sometimes but not always
yes you can use the xbox 360 controllers on the xbox 360 slim. I use my controllers from my old xbox on my new 360 slim.
You can not play xbox 360 games on an original xbox, however you can play some original xbox games on an xbox 360 console.
No.
No.