Техническая Спецификация для Aten 2-Port USB 2.0 Peripheral Switch US221

Hotkey Operation (Windows Only)

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Press [Num Lock] twice to bring the peripheral focus to your 
computer.

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Press [Scroll Lock] twice to move peripheral focus from the 
current port to the next port (US-421 only). You must enable 
the Next Port Hotkey to use this function (see p. 12).