PPCoin Proof of Stake mining

[JustinM3]

Newbie question (I can't find a clear answer anywhere):

I correctly set up my PPCoin wallet for POS mining, but what do I do next to get POS mining coins? 

Do I have to leave the wallet program running all the time?  Or do I just run it when I want to do a transaction?
If I have to have it running, do I leave it "unlocked for minting purposes only"?  Or do I just let it run w/o unlocking it?

I've read that I only to have to run the program once every 30 or 90 days to benefit from POS mining.  Is that correct?  When I do run it once every 30 or 90 days, do I also need to unlock it?

Thanks