''LPC - Local Procedure Call ''
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LPC (LocalInterProcessCommunication and NOT Local Procedure Calls) is a high speed message based communication mechanism implemented in the NT kernel. 

LPC is to be used for communication between two user mode processes.
* between a user mode process and a 
* kernel mode driver 
 or 
* between two kernel mode drivers

An example 
* two user mode processes communicating via LPC