Keyboard trackballs can be purchased separately and plugged into an available keyboard USB port, or can be found already embedded into the frames of the keyboards themselves. Many people, especially business travelers or computer programmers, use keyboards with embedded trackballs because they can be transported easily from one location to the next and do not encumber their users with extra wires. However, if an embedded trackball fails or is broken, one has to either repair it immediately or purchase an external trackball (or mouse) and plug it in to get the computer working again.

In general, people who have difficulties gripping a standard computer mouse prefer trackballs. It also takes up less space than a mouse, since it does not have to travel across the expanse of a mouse pad. Some trackballs are so easy to use that individuals with carefully controlled feet can manage to use them!

Keyboard trackballs eliminate the need to move the wrist from the keyboard to an adjourning space. This is an extremely ergonomic layout, one that can benefit anyone who is suffering from repetitive stress injuries like Carpal Tunnel Syndrome or those who wish to avoid the pain associated with similar forms of wrist damage. Physical therapists, especially those who deal with office workplace ergonomics, recommend these types of keyboards rather than the keyboard-and-external-trackball setup.

Choosing the Placement of the Trackball within the Keyboard

Some keyboard trackballs are placed between and directly below the area where the thumbs will rest. The user will then be able to use his or her thumb to navigate the pointer and perform single and double-clicks. On the other hand, many people prefer the trackball to be located near the side of the body that the leading hand is most commonly located (usually the right for right-handed people and the left side for left-handed people). Another option is to purchase a specialized keyboard wrist pad with its own trackball built into it on one side; if the typist chooses to switch hands and use the trackball in an ambidextrous manner, all she has to do is reverse the wrist pad.