You can't download Fallout New Vegas add-ons, you have to buy them with REAL money.
If you were to download them online if you have a PC, that would be considered illegal.
The Master's Cathedral was only acessible in Fallout 1, and is too far West to be included in New Vegas.
yes but only if you have dogmeat unless playing new addons and have puppies perk
Only on the PC version.
As far as I can tell, the only thing you can do online in Fallout 3 is get updates, patches, and buy downloadable content.
No, you can only craft, find or buy the dart gun in Fallout 3.
Ulysses only appears in person in the final DLC pack 'Lonesome Road'.
You can't mod the console versions, only PC.
Only the DLC 'Honest Hearts' is playable after completion at present, the remaining two DLC's 'Old World Blues' and ' Lonesome Road', will also allow you to return after completion. Once you leave the area at 'Dead Money', there is no way to return.
It appears to only have a single player game mode see related link
Console Commands can only be used on pc and they are opened by pressing the~ key
The only one I can think of is the Sleepytyme, with the gun runners arsenal pack
fallout.wikia.com Says, that there will be deatclaws