PS3 - if I turn off the machine will it still download the demos in the background?

[StormRider]

I'm a newbie PS3 owner and I still learning the system. I'm trying to download some demos now and I'm wondering if it will still download if I put turn the PS3 off (actually I think it goes into standby)

 

[biff 24 2000]

nope

 

[DaveSimmons]

nope but it will resume the download from where you left off.