LinkProtocol is an option to LinkLaunch, Install and related functions which specifies the underlying data transport protocol to use for a new MathLink link.
Typical settings for LinkProtocol are "SharedMemory" and "FileMap" (Microsoft Windows), "PPC" (Macintosh), "Pipes" (Unix) and "TCP" (all platforms).
See The Mathematica Book: Section 2.12.5.
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