typedef struct _MMSECTION_FLAGS
{
     ULONG BeingDeleted: 1;
     ULONG BeingCreated: 1;
     ULONG BeingPurged: 1;
     ULONG NoModifiedWriting: 1;
     ULONG FailAllIo: 1;
     ULONG Image: 1;
     ULONG Based: 1;
     ULONG File: 1;
     ULONG Networked: 1;
     ULONG Rom: 1;
     ULONG PhysicalMemory: 1;
     ULONG CopyOnWrite: 1;
     ULONG Reserve: 1;
     ULONG Commit: 1;
     ULONG Accessed: 1;
     ULONG WasPurged: 1;
     ULONG UserReference: 1;
     ULONG GlobalMemory: 1;
     ULONG DeleteOnClose: 1;
     ULONG FilePointerNull: 1;
     ULONG GlobalOnlyPerSession: 1;
     ULONG SetMappedFileIoComplete: 1;
     ULONG CollidedFlush: 1;
     ULONG NoChange: 1;
     ULONG Spare: 1;
     ULONG UserWritable: 1;
     ULONG PreferredNode: 6;
} MMSECTION_FLAGS, *PMMSECTION_FLAGS;

Windows Vista Kernel Structures