This web site is configured for three kinds of users: unregistered, registered and authors. Anybody can become an author upon request and we prefer to register users to keep a tab on the site usage and to inform people about important updates.

Unregistered users, have access to the general information and some content made available to "whet the appetite".

Registered users, have access to the whole published content of the site, including downloads, image gallery and so on. They can add comments and they can vote certain items and participate in polls. Becoming a registered used is easy and is free. Registering users help us keep the site more efficient.

Authors are special users that have the privilege to add/edit the site articles and other contents. New articles need the editor/administrator approval that will check them only to ensure that some level of quality is guaranteed.

A major point is that all users can send comments about the content of this site. The main purpose of most of the articles is that to spread knowledge or to establish firm points from where to start gathering new knowledge. Therefore any help in completing, correcting or even expressing in better form any article will be warmly welcome. 

And of course, if a user wishes to provide any kind of material for this site, an article, a picture, a drawing, a document, he/she can contact us for a prompt reply and may even be given the author privilege for a more continuous contribution.