typedef enum _MMLISTS
{
         ZeroedPageList = 0,
         FreePageList = 1,
         StandbyPageList = 2,
         ModifiedPageList = 3,
         ModifiedNoWritePageList = 4,
         BadPageList = 5,
         ActiveAndValid = 6,
         TransitionPage = 7
} MMLISTS;

Windows Vista Kernel Structures