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Im not sure lol my friend said so some plp didnt iI NEESD AN OFFICAL ANSWER
No it doesn't Halo came out before XBL did so it does not work with xbl
some plp were playing it on ther thoguh i seen videos and plp downloaded programs to
No, it does not happen. You can use something called XBC, which, I think, stands for Xbox Connect. However, this costs money, and I don't use it. If you want to find out about it ask someone who does know.
It's free.