Each member makes and stores his/her working documents as a hyper-text.
This is a set of HTML documents linked one another.
A homepage is, as a whole, a document of the form called "hypertext".
A homepage is constructed as a hypertext of HTML pages.
In the case of a page of "book", there are no more than "previous" and "next". But in the case of the homepge, links are freely made in the way of "jumping to the other page by clicking button".
