Input/Output details on components?

I grabbed this screenshot off a youtube video (1:45 at You CAN'T Miss This Parametric Algorithm - YouTube). I’ve always wanted to be able to see what’s going into and out of a component without having to add a panel or some other sort of display component. Anyone have any idea where this ability comes from? I’ve posted a question to the video author and thought I’d ask here. Thanks!
grasshopperDeets

Sunglasses:

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oh jeez that’s great. I had that installed, but not the most recent version. thanks!