This is especially true if speech is also used or if operating in a network. Magnification programs function similarly to a magnifying glass moving over a page. Programs can automatically follow the cursor, magnifying the area around it. It is also common to be able to automatically move across and down a magnified page at a pre-set speed. Additionally, in the event of losing your place in a magnified document, programs can show the unmagnified screen, emphasizing the magnified area with color or shading.
Most programs allow the user to change colors.
In DOS, features of screen magnification programs are manipulated through menus which pop up on part or all of the screen, or through single keystrokes. In Windows, products are manipulated through menus, dialogue boxes which display all or most of the available options, and keystrokes. In addition to screen magnification software systems, SuperVista, from TeleSensory Corp., is a magnification system made up of software, a card that is installed in the computer, and a three button mouse. This setup uses memory much more sparingly. Most of SuperVista's functions are controlled by the mouse.