Exchanging data between frames

I’ve a frameset with 2 frames. The first is of type “Named Element” → Form, the second one is of type “URL” and access a Web application (running on Websphere). The WebApplication allows the user to navigate thru a long list data and the user “select” an item from the list.

I would like to know how I can get the data selected by the user in the webapp from the form contained in the first frame.

P.S: I can modify everything: Notes application and/or WebApplication.

Many thanks in advance.

PP.S: Excuse my English