Sticky keys

Sticky keys is an accessibility feature of some graphical user interfaces which assists users who have physical disabilities or helps users reduce repetitive strain injury.

Sticky keys functionality is available on/in Microsoft Windows, macOS, chromeOS and KDE Plasma as Sticky Keys,[1][2] and on Unix/X11 systems as part of the AccessX utility.

introduced to System 6 as part of the Easy Access extension, which also included mouse keys functionality.

[5] In 1994, Solaris 2.4 shipped with the AccessX utility, which also provided sticky keys and mouse keys functionality.

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Sticky keys on a Windows laptop.