Halo 3, 2profiles at the same time?

[Music Man]

Quick Question, can you play games like halo 3 using two different Xbox-live accounts at the same time. We want to buy a second account because my dad and I play togeather. Why? Because we both want to use a microphone headpiece at the same time.
I'll get a second mic, a better one at that.

 

[=][=]

ya u can
go to matchmaking then with the other remote the second person can join
im pretty sure thats how i did it.
=]
dont get ur @ss beat

 

[christian]

he doesn't know what he is talking about because me and my brother used 2 profiles at the same time and both hade mics and played Halo 3 online

 

[Herman]

you can use two or more different accounts at the same time but you will have to buy different headsets for each account

 

[Avenged Disturbia]

No you can't use the same mic at the same time but you can use two different accounts at the same time