If it is on the PC, you can only do that by modding.
you walk on top of it
you walk over the gun and press x
No, but you can board, walk around on them and destroy them.
Google, Halo: Reach mission 7 exodus walk-through. There are plenty of sites that can help you.
you can find a video walk-through on youtube.com
Just walk through the doors that open. When you need to walk through vents turn on your torchlight and walk until you get out.
You walk to the back of a enemy and HOLD the punch button to Assassinate.
you cant...unless your talking about supreme laggage!!!!
you need a cheat code, or if you cant find one the only other ways are to 1. mod halo 3 2. hack into your your xbox control thingy and hack into it
If you are referring to a flood, they are called carrier forms. My advice when facing these
You have to walk through the blue shields, you can't drive through with any vehicle
yes you can, walk up to someone line them up then press B X R!