Over HTTP you make one request, you get one resource back. Getting stuff to generate in multiple frames is not trivial.

A relatively sane approach might be to make your request to target="_top" and replace the frameset each time. Then store the results you want to display somewhere, and pass an identifier back to the browser in the src attribute of each frame from the generated frameset.

The browser will then request the two pages passing in the identifer, you can retrieve the actual page or the log based on the request. The data will then be displayed in the frame.