struct MMADDRESS_NODE

typedef struct _MMADDRESS_NODE
{
     ULONG u1;
     PMMADDRESS_NODE LeftChild;
     PMMADDRESS_NODE RightChild;
     ULONG StartingVpn;
     ULONG EndingVpn;
} MMADDRESS_NODE, *PMMADDRESS_NODE;

Windows Vista Kernel Structures