Omaha
Omaha is a poker game in which each player receives four cards (hole cards) dealt face down, while five cards (community cards) are dealt face up on the table. All players play their best five cards, but they must use exactly two of their four hole cards in combination with exactly three of the five common cards on the table. The best five-card poker hand wins the Pot.

Betting rounds
Betting structure in Omaha Hold'em is the same as in Texas Hold'em. The game will commence by players placing their respective blinds
In Omaha Hold'em there are four possible betting rounds. Here is the typical betting sequence for Omaha Hold'em:

Ante
Each player is dealt four cards face-down (pocket cards) - Card 1,2,3 and 4

The rounds

1 First betting round (lower limit): Dealer turns over three community board cards (the flop) face-up - Card 5,6 and 7
2 Second betting round (lower limit): Dealer turns over 1 more community board card (the turn) - Card 8
3 Third betting round (higher limit): Dealer turns over 1 final community boardcard (the river) - Card 9
4 Final betting round (higher limit)

Showdown
When all the betting is done, and if more than one player is still in for the pot, then the showdown determines who wins. The last player to open or raise is required to show cards first, and anyone else can fold (muck his cards if he/she determines he/she has lost. Players who elect to fold do not have to show their cards).

At the showdown players MUST use exactly: two of their pocket cards and three board cards. 

Betting structure
Each bet and raise during the first two rounds is set at the lower limit of the stakes structure. For example in a $2/$4 Fix Limit game, all bets and raises are $2 for the first two rounds (after pocket cards are dealt and after the flop).

Betting and raising during the last two rounds is set at the higher limit of the stakes structure. In this example all bets and raises will be $4.

The maximum allowable number of bets during any betting round in Omaha Hold'em poker is four. This includes a (1) bet, (2) raise, (3) re-raise, and (4) cap. The term cap is used to describe the 3 rd raise in a round since betting is then capped and can't be raised further. Once capped, players will have only the option of calling or folding.
There are other games that where cap on number of raises does not apply and they are No Limit and Pot Limit games. One on One games have a cap after 6 betting rounds.

Blinds
The small blind is a forced bet made by the player to the immediate left (clockwise) of the dealer button. The big blind is a forced bet made by the player to the immediate left (clockwise) of the small blind. The small blind is usually the half the lower limit bet while big blind is usually the same as lower limit bet. In Omaha H old'em the player with a small blind is the first to receive a card.

Big Blind Option
The player who has the big blind is given the option to fold, check or raise if no one has raised before him/her. If someone has raised he/she will be giving option of fold, call or raise.

Missed Blinds
To prevent "blinds" abuse players are required to post the small blind and the big blind once per round or their equivalent upon reentry to the game if the blinds are missed. Our software will prompt you if you have missed one or both blinds to put in the correct amount. You can also wait for the big blind to get to your position or to continue "sitting out" until you are ready to resume the game. If you choose to wait for big blind this is called coming in on the blind. In our Poker room if you miss three big blinds in the row you will be automatically removed from the table.

These rules are to prevent players from constantly entering poker games in late position and leaving before they're required to post.

Both blinds in Omaha Hold'em games are considered live bets and therefore, according to poker rules, have the option of checking, calling, raising or folding when the betting action returns to their position. After the flop and each subsequent betting round, the first active Omaha Hold'em player left of the button is first to act.

First Round
After the players in the blind positions put their blinds in front of them, the dealer deals four cards (pocket or hole cards) to each player (one at the time), at which time each player can see his own cards but not those of his opponents. On the first round only, the betting starts with the player to the left of the big blind, who has one of three choices, call, raise, or fold.

On the first round only, a player cannot check (make no bet) and still retain his hand. On the first round only, the player in the small blind position acts after the button. The player in the big blind position acts after the small blind.

Succeeding Rounds
In all rounds except the first, the betting starts with the first active player to the left of the button, who has one of three choices, check, bet, or fold. Until there is a bet, each succeeding active player has the same choices. Once a bet is made, each succeeding player then has in turn one of three choices, call, raise, or fold.

Bet/Raise/Call/Check/Fold
Once a betting round has started you must select one of these options from the play buttons that appears when it is your turn. If you choose one of the advance options (advance buttons), your bet is made automatically on your turn. If you select Sit Out or you close the window after a round has started, your bet will be considered a fold. If you click "Sit Out" button before the game started and you change your mind and than click "Deal Me In" button you will still be seated out for that hand. If your connection is lost, your hand will be played as an all-in bet.

Dealer Button
At the table a graphic called the Dealer Button, a small round disk with the letter 'D' marked on it, is used to signify the theoretical dealer of the hand. The hand is deal clockwise one card at a time.

Betting Order
The Omaha Hold'em cards are dealt in a specific order starting clockwise from the button and betting also takes place in a specific order as outlined below.

Rake
Unlike other casino games, poker is a game among players, and not a game against the house. Therefore the poker room makes money by collecting a rake. The rake is a predetermined amount that is removed from the pot. The rake amount varies depending on the number of people seated, the limits of the table, and the amount of the pot. The maximum house rake on the pot is $3.