typedef struct _MMADDRESS_NODE
{
    union
    {
        __int64 Balance : 2;
        MMADDRESS_NODE *Parent;
    } u1;
    MMADDRESS_NODE *LeftChild;
    MMADDRESS_NODE *RightChild;
    unsigned __int64 StartingVpn;
    unsigned __int64 EndingVpn;
} MMADDRESS_NODE, *PMMADDRESS_NODE;