Pass a parameter from one ASP portlet to another ASP portlet

Question

We are trying to pass a parameter from one ASP portlet to one or more other ASP portlets.
We are using PDK-URL Services and have created a provider.xml for each of the ASPs and the ASPs work as normal within the portlets created.
We are now trying to use PDK-URL Services to pass parameters to a portlet. As a first step we set up a portlet which displayed an ASP, this ASP (and the portlet) expected a parameter. If the parameter value is left blank the Portlet displays a default page (not the ASP page) for passing in the parameter i.e. a text box and a submit button. If the parameter is entered and submitted the ASP page returns and the results of the query are based on the parameter typed in.
As the next step what we are now trying to do is pass a parameter from one ASP portlet to another.
The Documentation says that there are two types of parameters Qualified where Parameters will be passed only to the initiating portlet i.e., portlet which contains them and Unqualified where all portlets will be affected by the parameter sent by any portlet.
Very little information was available on this, apart from the one liner explanation of each (above).
When we tested the above, using the PDK sample ("ParamCustomizationPortlet") portlets it doesn't appear to be doing anything in particular.
Any ideas on the best approach to passing parameters from one ASP portlet to another?
Thanks for your time.

Answer 1

We can visualize Qualified and Unqualified parameters only when there are multiple portlet instances in a single page. For example, add two instances of ASP portlet you have created, and submit from one portlet. You can see the other portlet also receiving this parameter, provided you are using unqualified parameters.
Thanks,
Amjad.