Group configuration structure.
struct{
DWORD dwSize;
BYTE byEnable;
BYTE byRes1[3];
NET_DVR_VALID_PERIOD_CFG struValidPeriodCfg;
BYTE byGroupName[GROUP_NAME_LEN/*32*/];
BYTE byRes2[32];
}NET_DVR_GROUP_CFG,*LPNET_DVR_GROUP_CFG;