typedef struct _COMMCONFIG {
    DWORD dwSize;               
    WORD wVersion;              
    WORD wReserved;             
    DCB dcb;                    
    DWORD dwProviderSubType;    

    DWORD dwProviderOffset;     

    DWORD dwProviderSize;       
    WCHAR wcProviderData[1];    
} COMMCONFIG,*LPCOMMCONFIG;