WTSQuerySessionInformation的CLIENT_ADDRESS问题

终端服务问题:WTSQuerySessionInformation中的typedef struct _WTS_CLIENT_ADDRESS
{
    DWORD AddressFamily;
    BYTE Address[20];
} WTS_CLIENT_ADDRESS, *PWTS_CLIENT_ADDRESS;BYTE Address[20]都代表什么?就知道:
IP = ("%d.%d.%d.%d",
     Address[2],
     Address[3],
     Address[4],
     Address[5]);
那Address的其他位分别代表什么?