Pointer Focus Registration Key Top [portable] -

The is the physical cap on a keyboard switch. It is the tactile bridge between human intention and digital registration.

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Microsoft's PowerToys includes a "Mouse Utilities" feature that provides a spotlight effect and mouse highlighting for free. pointer focus registration key top

Edit your .xmodmap or use xinput :

Ensure your key is for the version of Pointer Focus you have installed (e.g., v2.0 vs v1.x). The is the physical cap on a keyboard switch