Omaha High Low Poker games are often played High/low split, with and eight-or-better qualifier for low. Players may use two different cards from their hand to make a low, and two different hand cards to make a high, as well as three different board cards to make their high hand and three different ones to make their low hand. The can also use the same three card/two card combination to make both their high and low hands.
For more Information:
http://www.omaha-high-low.org/omaha-game-play/playing-
the-river-the-non-nuts.html 
