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[[!meta copyright="Copyright © 2002, 2003, 2007, 2008, 2010 Free Software
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An *IDL* is an *interface definition language*. The most well-known is CORBA.
An IDL compiler takes a specification and generates stub code that hides the
transport details, and by this implements a [[RPC]] system.
In the case of [[Mach's MIG|microkernel/mach/mig]], this hides the marshalling
and unmarshalling of parameters according to [[microkernel/Mach]]'s semantics,
and invoking the respective [[microkernel/mach/port]] operations.
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