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An “alert” bid can only be explained by the partner-not by the one who says “alert”. If a wrong interpretation is given, the DIC must be summoned before play begins and an explanation given.
However, it is nowhere explained what might constitute an "alert" bid!
And narry a word is written on the matter of allowable systems, so presumably they are the solution for Americans who want to play Kaplan Inversion, Woolsey or even Forcing Pass.
They do vaguely specify that the "American edition" (presumably ACBL) of the "Laws of Duplicate Bridge" are to be used, but then occasionally contradict them with statements like
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Dummy is not permitted to call the director until the end of play.
Makes me almost wish I lived there so I could attend one of their tournaments. Just one though, I think.