Newb WholeHog III question

I fiddle with a WholeHog III system with a DL 1 projector a couple days a week. The show that another person made is nice and shows some stock video from a Catalyst server that is part of the rig.

I tried to make my own show and pretty much copied the patching from the original show. I can program the DL 1 to move however I want it to, but I cannot make it show any images via the Catalyst. I patched the Catalyst how the other show is, but I can't figure out how to put the visual.

Is there anybody who can tell me what the general way to send a command from the Hog system to the Catalyst to play a certain file?

Thank you!
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