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Windows and Internet Explorer: Alt + Accesskey + Return
Windows and Mozilla/Firefox/Netscape: Alt + Accesskey
Windows and Firefox ab Version 2.0: Alt + Shift + Accesskey
Windows and Opera: Shift + Esc + Accesskey
Macintosh and Internet Explorer: Ctrl + Accesskey + Return
Macintosh and Safari: Ctrl + Accesskey
Macintosh and Mozilla/Firefox/Netscape: Ctrl + Accesskey
Macintosh and Opera: Shift + Esc + Accesskey