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by ghaff 2641 days ago
>by wandering down to their office and knocking

FWIW, all the places I've worked that had offices in whole or in part had a culture in which everyone left their door open unless they didn't want to be disturbed for some reason. Collaborating was never an issue. If everyone always kept their doors shut, I think I would have found that hindered communication, esp. pre-IM.