I have a friend about to write and it needs to have links to content inside of the book. Also, I am trying to get him to write two related books, so the content pointed to by the link could also be in another book on the same CD or web page.
I know HTML is perfect for this, but what other languages or tools cold be used to create such a methodology.
Can a PDF file have links to another PDF file, for example?
I'm interested in hearing what you have to say.
Also, HTML might be complicated for him to have to create his own links.