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If I understand correctly: #;FORM is equivalent to: #|FORM|# The difference is that the end of the comment is implicit by the end of the form. The only advantage I see it makes it easier for a programmer to comment a form in or out without having to find the end of the S-expression. But how difficult is this, especially if you're using an editor that supports S-expressions? On the other hand, the #:FORM syntax is harder for humans *reading* the code, since it's not visually obvious where the comment ends. -- --Per Bothner per@xxxxxxxxxxx http://per.bothner.com/