Multiple windows in Mathematica help

I'm new in Mathematica, and would like to know how can I open multiple help windows at the same time. It's this possible? I'm using Mac OS.

I know it works for link in the help page with right mouse click, but not for drill down in another function (that is not a link).

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You can do Help-> Documentation Center as many times as you wish. –  b.gatessucks Dec 23 '12 at 17:24
Shift + F1 instead of F1 –  Rojo Dec 23 '12 at 17:31
you can right click on hyperlinks in the help system and select "open in new window" –  acl Dec 23 '12 at 17:33
@Rojo tks, it's exactly this, but unfortunately Shift + F1 works just for Windows, not for Mac. –  DMurta Dec 23 '12 at 18:04
Find KeyEventTranslations.tr and look for a line like this  Item[KeyEvent["F1", Modifiers->{Shift}], SelectionHelpDialog[False]],. If nothing similar is there, try adding it –  Rojo Dec 23 '12 at 18:08