I'm not sure what you are referencing, could you be more specific, and links are ok.
Viewing post in Ultimate Shader Playground v0.55 (Early Access) comments
Oh sorry, i referencing about that site: https://spout.zeal.co/
So the most VJ apps have it. Its like an virtual audio cable but for video.
It was great to record the virtual video from another app, like https://www.lightjams.com/spout-recorder.html
i would love to send the shaders into other softwares, like https://www.hypertonal.net/cathodemer/
or e.g. Adobe premiere, which have all support for input and ouput of generated materials via spout. It would be a great addition. Anyways, i think i am drifting away from your main focus ;)