Calling portlet from a normal web application

I have the following question:
I would like to deploy portlets on Oracle Portal and "call" them programmatically from a home made web application running on the same Oracle Application Server where the portal runs.
As I am running my web application on the same server I would like to avoid WSRP and SOAP calls.
I am aware of the existence of the new Web Center and the possibility it gives to include portlets in web application ... but I cannot use the Web Center for now mainly because of licensing problems and application server versions.
Is there an API (Java, PL/SQL or anything else) allowing to "call" a portlet deployed on Oracle Portal ?
Thanks for the help.
Nicolas

Hi,
Well, I did my JSP pages doing selects to OWF tables and OWF java APIs. I used owf pl/sql procedures as my reference. For example, I need to know how to create actions buttons. I looked at wfa_html procedure and looked for how it was doing that.
Any doubts just ask,
Regards,
Luiz

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