Min version	XP	2003/XP64 SP1		Vista	Vista SP1	7		8 Pre RTM		8
Max version	2003/XP64	2003/XP64 SP2		Vista SP2		7 SP1				10 TH2
Architecture	x86	x86	x64	x86	x64	x86	x64	x86	x64	x86	x64
x86 offset offset:bitpos	Field Name											x64 offset offset:bitpos
0x0000	long Count			volatile long Count						long Count		0x0000
0x0004	struct _KTHREAD * Owner							void * Owner				0x0008
0x0008	unsigned long Contention											0x0010
0x000C	struct _KEVENT Event	struct _KEVENT Gate				struct _KEVENT Event						0x0018
0x001C	unsigned long OldIrql											0x0030