This "double click to launch" used to be a pretty common idiom at one
time,
though browsers have watered it down in some contexts.
FWIW - I'm not an expert on this, but I believe that in Windows the single-
vs double-click-follows/activates behavior is a user option. I would guess
(but don't know) that most Windows users now use the single-click behavior.
I don't know if following links and other actions (e.g. open) follow the
same principle (option value).
Perhaps someone else can speak to this more authoritatively.
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