One of the first steps you should take is to determine whether your game was lobby-launched. To do so, create and initialize a lobbied application object (CLSID_DirectPlay8LobbiedApplication). When you do so, you pass the object a pointer to your lobbied application message handler. This message handler receives messages directly from the lobbied application object, and indirectly from the lobby client and the lobby.

• If the application was lobby-launched, the IDirectPlay8LobbiedApplication::Initialize method returns a connection handle for the lobby client and a DPL_MSGID_CONNECT message is sent to your lobbied application message handler. The pdplConnectionSettings member of the associated structure points to a DPL_CONNECTION_SETTINGS structure that contains connection information such as address objects for the members of the session.
• If the application was not lobby launched, you will receive neither the connection handle, nor the message. However, if you call IDirectPlay8LobbiedApplication::SetAppAvailable, a lobby client can later connect your running application to a session by sending your lobbied application message handler a DPL_MSGID_CONNECT message.

You should also create and initialize a peer object (CLSID_DirectPlay8Peer). This object will be your primary means of communicating with Microsoft® DirectPlay® , and the other users in the session. If you want to have multiple players in the session, you must create a separate instance of this object for each player.