It stands for Down Loadable Content.
It lets you redeem certain things for games (example, and extras that aren't normally in the game).
You might get it if you pre-order games or special edition things.
If you get points (like Microsoft points or credit cards) you might get it.
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shortly after the dlc is downloaded, when you play the game a message will apear giving you a description of the dlc and where to start it. or you will pick up a new radio frequency.
go to games for windows find the fallout 3 dlc buy it and you will have it
NO!
There is no code for ascension. It is the zombie map in the first strike PS3, Xbox 360, & PC dlc sold for $15 or with the limited editions Call of Duty Black Ops for those game versions
You have to either pre order it at best buy or get it as a DLC but if you do not have xbox live you cant get it as a DLC