Developing web applications can be difficult. Many programmers have developed complicated systems to massively simplify the process. These systems work very well if your indended purpose closely matches the intention of the authour. The cost of using these systems is the steep learning curve required to understand the system properly and the lack of flexibility if the system doesn't quite match your intended purpose.
The Web Modules take the opposite approach. By making the really simple functions available easily in a modular form you can quickly build your own system without having to reinvent the wheel or learn a new framework every time you want to write a new system. The Web Modules are desinged to be an extremely flexible toolkit to allow you to program any way you want as easily as possible whilst still giving you the functionality you require to build complex systems quickly.