A system, method, and program support a flexible framework for providing communications between the layers of a software application. A processing unit is operable to execute a communications API (Applications Program Interface), the communications API virtually or effectively interconnecting presentation logic and business logic associated with a software application. The communications API transparently and interchangeably executes desktop implementation of the software application and a network implementation of the software application. The desktop implementation, the network implementation, and any switching between implementation modes may be transparent to the presentation logic and/or the business logic. The software application may be an n-layer application, and the communications API may arrange the order of the n-layers based upon whether desktop or network implementation is to be employed. The presentation logic and business logic may be associated with different machines located at a distance.