Autodesk documentation on this is not great. They don’t do a good job of telling you how this works, it just shows you some examples that you are apparently supposed to run and then reverse engineer the function by it’s results.
Anyway, there is a source attribute, that is the first argument, then there is the target attribute, that is the second attribute.
This takes the 1st selected attribute of an object and connects it to the second object’s attribute:
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