>This idea with a hidden frame is what I need. But how exactly will I process data returned from server? Foxisapi returns HTML. Will I have to parse within JS on the hidden page? Please explain.

Your hidden frame will load a form that contains input objects to hold data to be passed to the server. Use Javascript to move the required data from the main page into the hidden form's objects and to post the form to the server. The returning HTML will be the original hidden form plus the required Javascript to move any returned data back to the main page, handle validation responses, etc. You can return data in a variety of ways such as in objects on the form or simply embed directly into javascript variables.

>So you are saying that doing things like this is more efficient than RS?

From a response perspective there is less overhead required than using RS but the actual difference is small. The main reasons I've steered away from RS is the need to handle multiple data sets and stability.

>And Yes, I am interested in RS framework code.

I'll email it to you this evening.