Page "Local Procedure Call" Paragraph 17
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( A ) LPC is used heavily in communication between internal subsystems in Windows NT.
The Win32 subsystem uses ( A ) LPC heavily for communication between client and the subsystem server ( CSRSS ).
Quick LPC was introduced in version 3. 51 of Windows NT to make these calls faster.
This method was largely abandoned in version 4. 0 in favor of moving the performance critical server portions into kernel mode ( win32k. sys ).
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