NT Architecture
WOW
(Win16)
Win32
Subsystem
Security
Subsystem
OS/2
Subsystem
POSIX
Subsystem
User Mode
DOS
App.
Win16
App.
Win32
App.
Win32
App.
Win16
App.
OS/2
App.
NT Executive
Executive Services
Hardware (Intel or MIPS or ALPHA or PowerPC)
Kernel Mode
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