I need to make a call from a style of VAP 7.4 to an instance of the portlet Web Connector 3.0 and pass a parameter to the URL at runtime or dynamically.http://www.****.com/reports.aspx/?code=4567
best way is to use the available extension points in Web Connector (available under the advanced tab in the details page of the portlet instance). for this example, you may wish to implement a custom transformer class but, based on the description, perhaps an interpolator class might work as well. There is an example package on the Developer Forum for Portal that has a sample interpolator, transformer, and other examples. The Technical Guide for Web Connector also has details on the extension points available and how to take advantage of them.
If you have problems finding the sample package let me know and I can just email it to you...
here is the link to the sample package for wc 3.0
https://knowledge.opentext.com/knowledge/cs.dll/open/17708577
I'm not exactly sure since I don't know the use case of your requirement but if you have an instantiated style type, and in that style type you have a custom tag or a call, then you should be able to allow web connector to "respond" (in some way) to that call made from the style type class. They are both portal-beans as well.
Perhaps if you give me a specific use-case you are working on I can think of a more clear way to do this?
Evan