When thinking about this material, putting my ideas together about what to write I realized that there were two different aspects of this course that should be treated separately: contents and accessibility to the contents.

My first approach to the CD was the wrong one. I thought I had a book that had not been printed and tried to get a first idea of its contents, as I do with books. Firstly, I do not need a set of instructions when facing a new book so, I did not pay much attention to the sheet of paper accompanying the CD....

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