This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
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MathLink API
Extensively used within the Mathematica system itself, MathLink is Mathematica's unique high-level symbolic interface standard for interprogram communication. With convenient bindings for a variety of languages, MathLink immediately allows arbitrary symbolic objects—representing data, programs, or any other construct—to be efficiently exchanged between programs, on one computer or across a heterogeneous network.
Install run a MathLink installable external program
LinkPatterns find functions available in a running MathLink program
mprep, mcc externally prepare a MathLink installable program
LinkLaunch, LinkConnect, LinkCreate initiate MathLink programs and connections
LinkRead, LinkWrite read and write expressions on a MathLink connection
Links list all currently open links