Suppose you're building a small laptop, but you don't have enough space to put a touchpad under the keyboard. What do you do now?
You can get the user to buy an external mouse, but you can also develop a pop-out mouse like HP. Hidden in the small space to the right of the HP OmniBook 800CT was a weird wedge-shaped mouse that emerged from the body when a small, cute mouse-marked button was pressed.
In the mid-'90s, there was no option for wireless, so a tiny mouse hung on a thin rubber cord. In fact, this worked as a novel solution to the problems that plagued many laptops at the time, with HP adopting pop-out mice on several different models. Speaking of trackpads, there was also an old notebook PC "Compaq LTE Elite 486" with a trackball on the right side of the display.