cache\  - cache manager
config\ - registry implementation
dbgk\   - user-mode debugger support
ex\     - executive functions (kernel heap, synchronization, time)
fsrtl\  - file system run-time support
io\     - I/O manager
ke\     - scheduler, CPU management, low-level synchronization
lpc\    - local procedure call implementation
mm\     - virtual memory manager
ob\     - kernel object manager
ps\     - process/thread support
se\     - security functions
wmi\    - Windows Management Instrumentation
inc\    - NTOS-only include files
rtl\    - kernel run-time support
init\   - kernel startup
