SkinMany poker sites have joined networks. For example, our partner Mansion Poker belongs tot he Ongame network. Mansion Poker is called a skin of the network.
All players who play on the skins of a network can play together at the same table even if they are not playing on the same skin. The individual sites serve the same player pool. Bwin and Pokerroom also belong to the Ongame network. You can register for Mansion Poker and then play against players who have registered for these sites.