wip documentation

docs/basic-concept.md

@@ -80,8 +80,9 @@ As time goes by and more people start using and enhancing the **Action Provider*
 
 !!! Note "Create your own"
     It is possible to develop your own specific actions, or indeed generic ones that others can use too! Check the relevant sections in this guide:
-    * [Introduction to creating your own][create-your-own-introduction.md]
-    * [Example of Email Preferences][email-preferences.md]
+
+    * [Introduction to creating your own](create-your-own-introduction.md)
+    * [Example of Email Preferences](email-preferences.md)
 
 In this example we have a first step: find the contact with the data from the form:
 
@@ -106,10 +107,21 @@ I can specify here what criteria I want to use, in this example I have specified
 
 At the *retrieval methods* part I can select how I want to retrieve my data.
 Here I would like an action called *Find contact with checksum*. Unfortunately that is not available yet because it has not been developed yet, but you get the gist.
-And it will be developed in the section [Email Preferences][email-preferences.md].
+And it will be developed in the section [Email Preferences](email-preferences.md).
 
 For each of my input fields I can finally specify what data should be loaded here, which should come from the result of my action.
 
+## Output Handler
+
+At the bottom of the form where you edit or create your form processor there is also a bit about an *output handler*:
+
+![Output Handler](/images/output-handler.png)
+
+This gives you the option to manipulate the output that is sent back to the public website once all the actions have been executed.
+If you do not specify anything, the default value of *send everything* then all the data involved is sent back (inputs, output from actions etc.).
+
+If you decide for example you only want to send the ID of the contact back you can select the *decide what to send* and specify what from all the available data should be send back and how it is called.
+
 ## That's it!
 If you click on the *Retrieval of defaults* tab in the **New Form Processor** form you will get a form like this:
 
@@ -117,7 +129,7 @@ And that is all! A form to be used without coding. Once I saved the form process
 
 ![API to be used](/images/api-to-be-used.png)
 
-So far the basic concept. Obviously the public website part needs to be done too, check the [Example Sign Up Newsletter][sign-up-newsletter.md] section for that part, this section just covers the basis principles.
+So far the basic concept. Obviously the public website part needs to be done too, check the [Example Sign Up Newsletter](sign-up-newsletter.md) section for that part, this section just covers the basis principles.