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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 (computer science)|kernel]] for lightweight [[inter-process communication|IPC]] between [[process (computing)|process]]es 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]] (UMDF), whose user-mode parts require an efficient communication channel with UMDF's components in the [[Architecture_of_Windows_NT#Executive|executive]].<ref>{{Harvcoltxt|Russinovich|Solomon|Ionescu|2009|p=201}}</ref>
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:
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