Most of us take the way we use a computer daily for granted. A keyboard, mouse and monitor seems necessary, even natural. Yet many people must rely on other means of interacting with a computer. Fortunately, Mac OS X has a number of accessibility features built-in which can accommodate the needs of most users. Here's what they are, and what they do. Finding Access Before you can worry about accessibility features you have to find them. Fortunately, that's a cinch. Just open the Apple menu in the upper left and then click System Preferences.