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Hands-free computing is any computer configuration where a user can interface without the use of their hands, an otherwise common requirement of human interface devices such as the mouse and keyboard. Hands-free computing is important because it is useful to both able and disabled users.
Closeup of a touchpad on an Acer CB5-311 laptop Closeup of a touchpad on a MacBook 2015 laptop. A touchpad or trackpad is a type of pointing device.Its largest component is a tactile sensor: an electronic device with a flat surface, that detects the motion and position of a user's fingers, and translates them to 2D motion, to control a pointer in a graphical user interface on a computer screen.
IBM sold a mouse with a pointing stick in the location where a scroll wheel is common now. A pointing stick on a mid-1990s-era Toshiba laptop. The two buttons below the keyboard act as a computer mouse: the top button is used for left-clicking while the bottom button is used for right-clicking.
A mouse is moved without the button being pushed. This state can be called tracking, meaning the user just moves the mouse without further interacting with the system. If the mouse is pointed at an icon and the button is pressed while moving the mouse, a new state called dragging is entered.
Sticky keys allows characters or commands to be typed without having to hold down a modifier key (Shift, Ctrl, or Alt) while pressing a second key. Similarly, ClickLock [18] is a Microsoft Windows feature that remembers a mouse button is down so that items can be highlighted or dragged without holding the mouse button down while scrolling.
Many are programmable, configurable computer keyboards and some control multiple PCs, workstations and other information sources, usually in multi-screen work environments. Users have additional key functions as well as the standard functions and can typically use a single keyboard and mouse to access multiple sources.
A double-click is the act of pressing a computer mouse button twice quickly without moving the mouse. Double-clicking allows two different actions to be associated with the same mouse button. It was developed by Tim Mott of Xerox Palo Alto Research Center.
One-button mouse Three-button mouse Five-button ergonomic mouse. A mouse button is an electric switch on a computer mouse which can be pressed (“clicked”) to select or interact with an element of a graphical user interface. Mouse buttons are most commonly implemented as miniature snap-action switches (micro switches).