Let’s look at it another way, you have a Writer and a Reader and you have channel wires going from a Writer on the right of the block diagram to a Reader on the left. You really should have some way of looking at the channel wire and knowing immediately which end of the wire has the Writer. Curved marks on the channel wire only indicate where the Writer is located in the block diagram. See attached file which shows where every writer and reader is in the sub VIs of this complex block diagram without opening them.
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Duplicate of
http://forums.ni.com/t5/LabVIEW-Idea-Exchange/Add-direction-arrows-to-the-depiction-of-channel-wires...