Party Poker enforces strict showdown rules for seeing hands, so when you win showdown you don't alway see the other hand. However, sometimes they give away a little information. Consider this dealer output where I hold AJo.

Dealer: ** Dealing Flop ** [ Jc, 3h, Th ]
Dealer: ** Dealing Turn ** [ 8d ]
Dealer: ** Dealing River ** [ 6d ]
Dealer: Fnord shows a pair of jacks.
Dealer: OtherGuy doesn't show.
#38517XXXX: Fnord wins $35.40 from the main pot with a pair of jacks with ace kicker.

Interesting that it said "with ace kicker" and not just a pair or jacks (usually the kicker is ommitted if not important.) I think this indicates I had the other guy out-kicked. So I get some information without seeing his hand.