| DirectX SDK | 
The DPLMSG_NEWSESSIONHOST message is generated by DirectPlay and sent to the lobby client/provider when the client on the computer becomes the new host of the application session.
typedef struct {
    DWORD    dwType;
    GUID     guidInstance;
} DPLMSG_NEWSESSIONHOST, FAR *LPDPLMSG_NEWSESSIONHOST;
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dplobby.h.