Same subject as in my previous post but a new question:

On the ConTeXt wiki-page Command\index one finds:

\index[...][...][…]

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What is the first argument for? Could it somehow be used to provide a key?

Another point, just for the sake of completeness: the example in my previous post yesterday, in ntg-context Digest, Vol 130, Issue 51,

contains a small error, or rather an omission. Not damaging for the example. Corrected in the book.

Best regards,

Robert Blackstone