No, the networks and games are not connected on the same servers.
You need an adaptor to play xbox live.
I don't really understand what you mean by this question.
I would recommend buying them from the Xbox 360 LIVE marketplace....
Yes, if they both have Live or one is a guest.
You need an adaptor to play xbox live.
Yes, my cousins have an Xbox 360 and they have halo one and two for regular xbox and they play it on their xbox
You can play many regular Xbox games on the Xbox 360.
No. Xbox One games will not be backwards compatible with the Xbox 360 console.
Yes, You need to download the xbox emulator for the 360 on the offical XBOX website(www.xbox.com) or update if you have LIVE. Check the xbox website for all combatable games
No. The games are developed for the updated console (Xbox 360). So they will not work, although you can play xbox games on the 360.
its the same as the one for the 360, its not xbox 360 live its xbox live thus working on both consoles.
You can't since the Xbox 360 has better graphics and things you can do on an Xbox 360. And considering that the Xbox 360 came out after the Xbox.