I6 question: what was the "special token" used for?

Inform 6’s grammar lines have words like “noun” and “creature” and so on, but one of them is “special”, which is either a number or a dictionary word. Inform 7 doesn’t seem to use it. What was “special” used for?

Nevermind, I found it in the DM3:

It was labeled obsolete in 1996.

Best I can recall, it was a crude way of handling numbers and topics in I5, before more specific tokens were invented for them.

Oh, except it’s still used today for the testing commands SHOWME and TEST. Well no matter, I can expose it as a useful understand token easily.