[Anaraxes]

I've always considered the "cast" in Identify Spell to include currently-maintained spells. That is, maintenance counts as casting for this purpose, not just the initial casting.

(And yes, that means you can ID any spell that's no longer being maintained, as long as it was maintained within the last 5 seconds. Fluff-wise, those magical echoes and remnants of currents that let you ID a spell are still floating around in the manasphere. It takes a while for them to all "level out", dissipating to un-Identifi-ability.)

GURPS rules are not in general written with the rules-lawyer attitude claimed for some rule sets that every tiny nuance in word choice is deliberate and meant to convey such subtle distinctions, so don't get too hung up by the use of the word "cast".