Keyboard Navigation
Some people with disabilities, whether because it's easier, quicker, or the only option available use a keyboard to navigate on the Web. The most common key used in keyboard navigation is the tab key. The tab key can be used to jump from link to link as well as from one object in a form to another. While this tabbing is usually built in to the browser, the order in which the tab's travel can and should be specified since the natural tab order may not be logical. Also certain browsers have support for keyboard shortcuts or access keys. These shortcuts can be tied to different links on the page. Since keyboard shortcuts or access keys are not standardized, they are coded and evoked differently depending on the platform.
Example
Links
Keyboard Accessibility Techniques
(http://www.webaim.org/techniques/keyboard)
