Downloading in background rules?

[Spiderbri]

ok need some insight.

I know you can't DL while watching movies.

But I can't figure out what the rules are when DLing behind video games.

I have started a DL, then popped in a game only to pause the game and see the % hasn't moved. I quit the game and it immediatly starts going up again. Meanwhile other times it goes in the background just fine and I get the message when it is done.

So what is it?

You can DL in background when playing a online game, like Burnout, because it piggy backs the info.

or You can only do it with an offline game because it needs the bandwith for the download?

That new Borderlands DLC is huge and will take me hours, I don't want to be playing a game for a few hours only to find it stopped downloading.

Thanks.