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If you are using a screen reader, you may find it will not read some documents in PDF format. VoiceOver for mac - Comes with every Apple Computer.NVDA - A free, open source screen reader for Windows.So it is useful to replicate the sort of content update issues that occur in JAWS and Window Eyes, when browser content is updated without a page reload. Used with Firefox it updates the virtual buffer in response to content changes (as does JAWS 7.1+ in both IE and Firefox). When used in conjunction with Internet Explorer it exhibits similar problems (as JAWS prior to version 7.1 and all Window Eyes versions in both IE and Firefox) with JavaScript (including AJAX) based content changes.
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Like JAWS and Window Eyes, NVDA uses a virtual buffer to provide access to web pages.
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