An integrated data network management and data service provisioning environment is provided. The integrated environment includes legacy software application code and current software application code each augmented with code portions enabling exchange of information therebetween via an interworking layer as well as support for limited application code load-up and execution. A facility for participation in and interacting with the integrated environment is also provided. A man-machine interface is integrated across different applications which themselves may be executed on different computers to provide a seamless exchange of information. Feature componetized application code is loaded and executed on a need-to-use basis, and unloaded when not used. Advantages are derived from enhanced resource utilization efficiencies in providing network management and service provisioning solutions. The interworking layer also provides for security enforcement across applications participating in the integrated environment.