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FilledSmallSquareint MLEndPacket(MLINK link) specifies that a packet expression is complete and is ready to be sent on the specified link.

FilledSmallSquareMLEndPacket() should be called to indicate the end of any top-level expression, regardless of whether its head is a standard packet.

FilledSmallSquare See The Mathematica Book: Section 2.12.9 and Section 2.12.14.