Operating Systems and Accessibility
There are a variety of options that can be set and preferences that can be adjsuted to make operating systems much more usable
The Ease of Access Center in Windows Vista or Windows 7 allow users to customize a variety of settings. There is also information available regarding Microsoft Accessibility Features in other windows operating systems as well as specific Microsoft applications.
The Apple Accessibility page details information specific to operating systems as well as portable devices.
The Voiceover feature is highly regarded and incorporated into a variety of products including the new ipad.