How does customization form pass parameters?

I need to create my own customization form so it can include linked LOVs and was wondering how the default customization form passed the LOV values back to the calling component.
I put two copies of the same report on a page and called the customization form for each report selecting different LOV values. Since each report displays the correct results based on the LOV, I assume page parameters are not being used and neither is p_arg_values/p_arg_values.
Can anyone tell me how this information is being passed to the individual reports?
Thanks, Larry

Sharmila,
I guess I'm confused, the parameters that are selected on the Customization screen are persistent across different login sessions.
Is is my understanding that passing parameters via p_arg_names/p_arg_values on the URL would not carry over from one logon to another or even allow me to navigate to another page and then back to the "customized" screen and still have the customizated values applicable?
Are you saying that once I call a page and pass a name/value parameter pair to the page, that the paramter values remain in affect for subsequent calls to the same page where the name/value pair isn't being passed?
Doesn't the customization screen use the wwpre_api_name and wwpre_api_value methods to pass parameters to components located on a page via the user preference storage?
When I look at the URL associated with the customization link on my portlets I see the preference_path being passed to the customization form.
Larry

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