Internet Hot Keys are supported for use with: Windows-based PC: Microsoft Internet Explorer version 5.0 or later; MSN® Explorer versions 7.0 or 8.0; Netscape Navigator versions 6.1, 6.2, 7.0; and AOL versions 7.0, 8.0, 9.0 Macintosh: Microsoft Internet Explorer for the Macintosh version 5.0 or later and Netscape Navigator version 6.1, 7.0 Multimedia Hot Keys are supported for use with: Windows-based PC: Versions of Microsoft CD Player, Microsoft Deluxe CD, Microsoft Windows Media™ Player, and certain versions of other popular media players and browsers Macintosh: iTunes * Sleep Hot Key functionality is available if your system supports power management and has it enabled, and if all peripherals are compatible with power management.