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The software that actually opens when the button is pressed.
Sony has ended official support for many older VAIO models (pre-2014), but downloads are still accessible through several official regional portals. sony vaio assist button driver download
The Assist button behaves differently depending on whether your computer is on or off: Software & Drivers - Support - VAIO The software that actually opens when the button is pressed
Here's the most reliable way to get the correct driver: sony vaio assist button driver download
This driver is critical for Windows to recognize special function keys and buttons on VAIO hardware.
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