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6.0, 6.1 or later
As See On Random Tip! (wrapped up into a simple gizmo)
GUI Input will be passed though and visible in the GUI.
RENDER input will only occur at render time.
NOTE: Rendering from inside Nuke uses the same GUI process, so you will only see the change when it's on put on the farm or command line using -x
Random Tip: "$gui" in expressions will return 1 in the UI and 0 at render time. Great for enabling nodes only when rendering on the farm (use it in the disable knob or Switch node).