DirectX SDK

CONST_DPLMSG

The CONST_DPLMSG enumeration is used to identify messages sent to and received from the lobby.

Enum CONST_DPLMSG
    DPLMSG_STANDARD =    2
    DPLMSG_SYSTEM =      1
    DPLMSG_USERDEFINED = 0
End Enum

DPLMSG_STANDARD: This is a DirectPlay-defined message. Processing of this type of message is optional.
DPLMSG_SYSTEM: This is a DirectPlay-generated system message used to inform the lobby of changes in the status of the application it launched.
DPLMSG_USERDEFINED: The message is defined by the application.