I strongly agree with this request. Though I'm pretty good, I certainly don't recall the syntax of every function I ever use in every language I use all the time. A lot of the time I'm off to the web to confirm syntax that I only vaguely remember. It would be ridiculously handy, as it is in other text editors and IDE's to be able to just click on a word and hit <cntrl>-<F1> and blammo, I've got the man page in Chrome.
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