struct MMWSLENTRY

typedef struct _MMWSLENTRY
{
     ULONG Valid: 1;
     ULONG LockedInWs: 1;
     ULONG LockedInMemory: 1;
     ULONG Protection: 5;
     ULONG Hashed: 1;
     ULONG Direct: 1;
     ULONG Age: 2;
     ULONG VirtualPageNumber: 20;
} MMWSLENTRY, *PMMWSLENTRY;

Windows Vista Kernel Structures