1 - Sample 1: Transitions
        A very simple application that has 2 or 3 HTML files
        which have transitions to each-other and have some
        links to external pages. 
        Explains the folder structure of a simple application,
        explains what are the transitions and the difference
        between the transitions and the links. Explains how to
        debug transitions.
        
2 - Sample 2: <Include> and <!--# Comments #-->
        Based on Sample_1 but adds some additional things.
        The HTML files now become templates. This application 
        uses the <Include> tag to insert the same header file 
        at the beginning of each template and to break the 
        templates into sub templates. It shows how to include
        the javascript code and the stylesheet of each template.
        It also explains the use of the framework comments and 
        the difference between them and the HTML comments.
        Explains how to debug the template structure.
        
3 - Sample 3: Introducing WebBox-es
        Develops further the Sample_2. Some of the templates are
        turned into weboxes. Explains the fundamental difference
        between a template and a webox. The PHP code of the weboxes
        declares the function onRender(), where some variables
        are added using WebApp::addVar(), and these {{variables}}
        are used in the corresponding template.
        
4 - Sample 4: Sending and Handelling Events
        Develops further the Sample_3. Some of the transitions send
        events to some of the weboxes. The target weboxes handle
        these events in their eventHandler() functions. Explains also
        the transitions to 'thisPage', sending an event to 'any' webox,
        and sending events to 'none' of the weboxes (independent events).
        
5 - Sample 5: Session and Variables
        Explains what are the session variables and how to use them.
        Explains further how the {{template variables}} are evaluated.
        Explains how the session variables are used to keep the state
        of the weboxes and the states of the application (introduces
        the function onParse() of the weboxes). Explains how the <If>
        elements are used to display templates conditionally.
        Explains how to debug the session variables.

6 - Sample 6: Interacting with a Database
        Explains how to set a default connection with a database.
        Explains the configuration file of a template (*.tpc) and
        the <Recordset> element. Explains the <Repeat> elements and
        how to use them inside a template. Explains the '.db' file
        of a webox, the <Recordset> and <dbCommand> elements inside it,
        and how to use the functions WebApp::execDBCmd(), WebApp::openRS()
        and WebApp::execQuery() inside the PHP code of the webox.
        Explains how to debug the recordsets of the page and the execution
        times of the queries (and other processes).

7 - Sample 7: All the rest of the advanced features
        A complicated, real and almost finished web application (which
        may evolve from the previous samples or may be independent of
        them), which makes use and explains almost all of the advanced
        features of framework which have not been explained in the 
        previous samples. Such features may be:
        - <Var> elements
        - Detailed explanation of the <Repeat> element and the page
          recordsets.
        - <Repeat> inside another <Repeat> that uses in the recordset
          a field from the first <Repeat>
        - An <Include> element that uses a variable.
        - Usage of an external webox.
        - Collecting a page (instead of sending it to the browser)
        - Etc.