when you activate them all you get the achievement called Marathon Man. It should unlock the armor called Security Shoulders
there are no terminals in halo reach did you mean halo 3 or anniversary
there isn't any
By holding the right bumper, it's the same as pushing a button or getting into a vehicle. But if it is a co-operative game then all players must be close to the terminal. Once everyone is near it someone can activate it.
The Seventh Column. Bungie has a thing for sevens.
Random journal entrys from the forerunners
I'm not sure how to use them, but when you activate a skull, I think it unlocks extras in the game.
The last halo you play on is an incomplete ring so it is not yet ready to be fired but when you activate it it overloads and explodes
you have to restart the game and activate skulls from the main menu
You go to "redeem code"...
Not much, except they provide you really cool information, and if you find them all you will get an achievement.
Because the scanner only activates to Forerunner DNA. Human DNA is similar enough to Forerunner DNA to trick the scanner
The skulls are used to activate cheat codes, such as recovering health when you punch an enemy. You activate these by pressing X at the mission selection menu.