Acer Aspire 5100 - Manual (Page 60)

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48-button remote control
If your Aspire is bundled with a TV-tuner card, a 48-button remote control is
included for use with the Acer Arcade software. The table below explains the
functions for this controller.
Warning! The Arcade and Power buttons have different functions
depending on the current mode. See below for details. Button
functions may change depending on your power option settings.
To access Arcade in Windows mode, push the Arcade button to start Arcade.
Push it again at any time to return to the main menu. Pushing the Arcade
button again will close Arcade mode. Pushing the Power button will put your
notebook into Standby mode. Push it again to resume.