While in the case of the deaf it will be necessary to
guarantee accessibility of video and content through
captioning, for the blind audio description, that is
verbal description of visual content should be made
available (http://www.washington edu/access
it/articles). In view of these challenges the National
Centre for Accessible Media (NCAM) has developed
a free software tool called the Media Access
Generator (MAGPIE) (http://www.washington.
edu/access). This software allows for multimedia
specialists, publishing companies and service
providers to add captions, subtitles and audio
descriptions to their work. The essence of
accessibility to assistive technology is therefore to
strive to make all web content accessible regardless
of the file format.