partypoker.com vs. partypoker.net?

Hi, Im new here.
I have a few questions about Party poker. What is the difference between partypoker.com and partypoker.net? I am interested in opening a cash account there, around $40 and it will be the first time for me. I think I will connect my checking account to Net Teller and use Net Teller to fund the Party account. Also will having cash accounts at other poker sites interfer with Party? For instance If I open a Poker Room account in the future, will Party close my account?

Any advice about using Parties software?

Thanks in advance. This is exciteing!