You Can't.
Yes they are the same games The system is just samller It will still play Most xbox and all 360 games
Of course the original Xbox 360 games are no different from the new Xbox 30 slim games.
I am Pretty sure it will, As the slim is an upgrade form the lower 360 platform so as long as you have the update from xbox live you should be able to play doom 3 on the 360 slim
No, the games aren't backwards compatible. Basically you can only play Xbox 360 games on a 360. But you can play most Xbox games on a 360.
Yes, Xbox 360 can play Xbox games.
Yes it is. It does so using a "backwards" format.
The Xbox 360 can play original Xbox games but the Xbox doesnt play Xbox 360 games.
Yes, the original games work on the 250gb slim. Not all original games will play with the 360 however, see the related links for a description.
Yes you can play Xbox 360 games on the Xbox Original
Yes, you can play Xbox 360 games on Kinect.
No the PS2 does not play Xbox 360 games only the Xbox 360 plays the games for it.
You can not play xbox 360 games on an original xbox, however you can play some original xbox games on an xbox 360 console.