I am writing a book on the topic and I maintain the Web AccessiBlog of links on Web accessibility. May also change the onscreen colours or move text from left to right in an inset window. On the net, most modern screen readers sit on top of standard Web browsers. You usually control a screen reader by keyboard, not mouse. Some links to screen-reader homepages are found in the Web AccessiBlog .
Braille displays can produce a single line of Braille or many lines.
Future updates This guide will be updated from time to time. It is particularly hard to encapsulate online access concepts in this format. But the whole purpose here is to act as a point of quick reference and further explanation. Mail me .