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What's a word for being curious in a worried manner?
Alarmed conjures images of alertness and action to my mind, which I think goes beyond the level of "advanced curiosity" the OP was aiming for.
Different forms of the abbreviations for “identification”?
Yes - I.D. seems to imply that it's an acronym, i.e. two words, whereas Id. implies contraction. Because it's essentially a nickname for something pronounced the way it's spelt, I'd go for ID anyway.