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FilledSmallSquareMLMARK MLCreateMark(MLINK link) creates a mark at the current position in a sequence of expressions on a link.

FilledSmallSquare Calling MLCreateMark() effectively starts recording all expressions received on the link.

FilledSmallSquare See The Mathematica Book: Section 2.12.12.

FilledSmallSquare See also: MLLoopbackOpen.