This screen allows you to activate Inline Code Evaluation. This means that you can say

               <script type="text/server-python">

                 print "Hello World!"

               </script>
            

               <p tal:script="text/server-python">

                 print "Hello World!"

               </p>
            

Many Zope 3 developers consider inline code blocks something very bad, since it does not follow the design of Page Templates or Zope 3 in general. However, application and application server developers are not the only audience for Zope 3. Scripters are used to inline code from other technologies like PHP and it fits their brain, which is very important.