The business logic implementation is similar to the way you generate html pages in a 3-tier (2-tier) architecture.
You realize how ASP, JSP, PHP or CFM would generate html pages. Well these same tools can generate XML files for Bambookit GUI. Thus the business logic will
reside in the middleware servers.
We are currently in the process of adding a 'Script' tag. This tag will contain 'javascript' like syntax to provide more logic processing on the client side.
This is still 3 months away from release.