The Local Procedure Call (LPC, often also referred to as Lightweight Procedure Call or Local Inter-Process Communication) is an internal, undocumented inter-process communication facility provided by the Microsoft Windows NT kernel for lightweight IPC between processes on the same computer. As of Windows Vista, LPC has been rewritten as Advanced Local Procedure Call (ALPC) in order to provide a high-speed scalable communication mechanism required to efficiently implement User-Mode Driver Framework, whose user-mode parts require an efficient communication channel with UMDF's components in the executive.
The (A)LPC interface is part of Windows NT's undocumented Native API, and as such is not available to applications for direct use. However, it can be used indirectly in the following instances:
- when using Remote Procedure Call API to communicate locally, i.e. between the processes on the same machine
- by calling Windows API which use (A)LPC (see below)
Read more about Local Procedure Call: Implementation, Known Usage
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