In this two-part series I show you how a tree can be used to facilitate your ACP projects. You need basic knowledge of HTML, JavaScript and Perl in order to understand this series.
A session can be broken down into categories, as we did in the shopping scenario above. Normally, in a session, you will have a first web page. From this web page you will have a number of web pages (links) you can go to.
When you click a link to go to a new page, that new page will also have links to other pages. You can carry on like this until you reach a final page.
As you can see, web pages can be organized in categories or considered to be in categories. A category of pages refers to pages produced by the same parent page.
Thinking in terms of sessions and categories
When carrying out your ACP (Active Client Pages) project, you should be thinking in terms of session and categories. A session can have sub-sessions. When you start a proper session, the first page you receive is called the master page.
As you can have sub-sessions, you can also have correspondingly sub master pages and sub stores. The sub master page and sub store are at the beginning of a sub session.
We shall not say much about these sub issues in this two-part series.
HTML 
How Browsers Respond to Active Client Pages
