3.2.5.2 DPSP_MSG_ASK4MULTICASTGUARANTEED

When a DirectPlay host receives a DPSP_MSG_ASK4MULTICASTGUARANTEED (section 2.2.15) message, it MUST validate that the PlayerFrom and GroupTo fields refer to a valid player and group, respectively, or else ignore the message. If valid, the host MUST then extract the wrapped message payload at the MessageOffset field and resend the message to all members of the specified group using the guaranteed message mechanism. If the game session has the Session.ReliableProtocol flag set, then the forwarded message MUST be re-wrapped, but with a DPSP_MSG_MULTICASTDELIVERY (section 2.2.37) header instead. The host MUST also increment the Player.ChatterCount counter.