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Sometimes I have difficulties trying to find some information whithin #emacs for specific functions.

i.e. When I do ~(set-frame-parameter nil 'alpha '(95 . 95))~

How can I get more info about the available ~frame-parameter~?

Why are two values in that alist (95 . 95)

I tried with C-h f set-frame-parameter but could not get any valid lead.