struct KEXECUTE_OPTIONS

typedef struct _KEXECUTE_OPTIONS
{
     ULONG ExecuteDisable: 1;
     ULONG ExecuteEnable: 1;
     ULONG DisableThunkEmulation: 1;
     ULONG Permanent: 1;
     ULONG ExecuteDispatchEnable: 1;
     ULONG ImageDispatchEnable: 1;
     ULONG Spare: 2;
} KEXECUTE_OPTIONS, *PKEXECUTE_OPTIONS;

Windows Vista Kernel Structures