MLLoopbackOpen() MLINKMLLoopbackOpen(MLENVenv,long*errno) opens a loopback MathLink connection. In an external program set up with MathLink templates, the environment stdenv should be used. You can use loopback links to effectively store Mathematica expressions in external programs. See the Mathematica book: Section 2.12.12. See also: MLCreateMarkMLCreateMarkMainBookLinkOldButtonDataMLCreateMark.
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