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Windows Internals, Fifth Edition by David A. Solomon Mark E. Russinovich and Alex Ionescu

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Advanced Local Procedure Calls (ALPCs)

An advanced local procedure call (ALPC) is an interprocess communication facility for high-speed message passing. It is not directly available through the Windows API; it is an internal mechanism available only to Windows operating system components. Here are some examples of where ALPCs are used:

  • Windows applications that use remote procedure calls (RPCs), a documented API, indirectly use ALPCs when they specify local-RPC, a form of RPC used to communicate between processes on the same system.

  • A few Windows APIs result in sending messages to the Windows subsystem process.

  • Winlogon uses ALPCs to communicate with the local security authentication server process, LSASS.

  • The security reference monitor (an executive ...

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