manage with no wiki summary exist on Stack Overflow, with 62 questions tagged. Some questions tagged with this, even not related to managed-code.
I think it should be removed (or renamed to managed-code).
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I found one -- one -- question that was actually about managed/unmanaged code in the context of .net, and it has been retagged.
Most of the rest are demonstration of some users' complete and total inability to tag. Some users, usually new users, think that tags are keywords, so they should stuff the tag list full of the same words that are in their question title or body.
The tag should be cleaned up, question by question. Each question should be retagged and otherwise improved and/or vote-to-close'd.
I just cleared all questions with the manage, put some of them into a better shape, removed tag lines, cast a few off-topic close votes.
tl;dr: manage is gone.