TABLE TENNIS has been part of the Summer Paralympics since 1960. At the London 2012 Paralympics, 174 men and 102 women will be competing in 29 singles and team events at the ExCeL venue from August 30 through September 8. Players compete against peers with similar disabilities in five classifications for wheelchair athletes, five for standing athletes, and one for athletes with intellectual disabilities. There are five team and 11 singles events for men across the various classifications, and three team and 10 singles events for women.
According to the description on the site of the 2012 London Summer Paralympics, "Team matches consist of four singles matches and one doubles match, each played over the best of five games. Each team consists of either two, three or four players and matches end when a team has won three individual games. In Doubles matches, standing players take turns to hit the ball, with one hit each before alternating. In wheelchair Doubles, either player of the pair may make returns after the receiver has returned the serve."
You can read more about Paralympic Table Tennis on the site of the International Paralympic Committee.