NT Architecture
WOW
(Win16)
Win32
Subsystem
Security
Subsystem
OS/2
Subsystem
POSIX
Subsystem
DOS
App.
Win16
App.
Win32
App.
Win32
App.
Win16
App.
OS/2
App.
Executive Services
Device Drivers
Kernel
Hardware (Intel or MIPS or ALPHA or PowerPC)
Hardware Abstraction Layer (HAL)
I/O System
File Systems
Object
Manager
Security
Reference
Monitor
Process
Manager
Virtual
Memory
Manager
Local
Procedure
Call
Facility
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