Teams can have two, three, or four players, but however many are on team, each one has to play one full "round of blinds" or the team will be disqualified. Also, players can tag in and out between hands, but not during a hand.

1) What is Team Poker (TP)\n\n Any poker game can be used in TP tournaments. Tournament Directors can split the Prize Pool Payouts from 0-100% to the individuals or teams. As example a typical split might be 60% to Teams and 40% to Individuals; or, Teams could play for Trophies  only.

The author of this thread has indicated that this post answers the original topic. Yes definitely buy it, the multiplayer servers aren't shut down they are just not very populated, you can still find games on vanilla WaW as well as plutonium WaW. The community and mod scene is still very much active on here.

Campaign co-op features up to four-players online, allowing gamers to experience harrowing campaign missions together for greater camaraderie and tactical execution.