SerialKey device (n)~ Enables you to attach an alternate input device (also called an augmentative communication device) to your computer’s serial port. This feature is designed for people who are unable to use the computer’s standard keyboard and mouse. SerialKeys (PN)~ A feature of Windows operating systems that in conjunction with a communications aid interface device allows keystrokes and mouse controls to be accepted through a computer’s serial port. It also allows the user to control the computer using alternative input devices as if they were using a standard keyboard and mouse.