Prototyping How To? Do you just trash everything you knew about requirements, architecture, data modeling and the methodologies that deal with good engineering and development? And then just hand out "hacking tools," line up in a row and start hacking?
Ah, no! All of that still applies.
So what's different. Mainly you eliminate the 90% of the time for actual coding. And before that even would start, you have a tool set and accomplishes standard patterns for traditional business information systems development.
Simply put, a good prototyping environment within a well-engineered business information systems development methodology enables you to let the "computer do" all the practices and processes that you used to do by hand during the first traditional phase, Preliminary Analysis.