An integrated source code file and a method and apparatus for creating a computer program from the integrated source code file. The integrated source code file is stored on a computer readable medium and the computer program created therefrom is executable by a computer system having a front-end for interfacing with a user, and a back-end for performing batch functions. The computer program comprises instructions for performing a function, which requires at least one parameter for its operation. The computer program further comprises instructions for validating the parameter, the instructions adapted to run on both the front-end and the back-end. The computer program also comprises graphical user interface information for creating a graphical user interface, which can be used to receive the parameter. The computer program still further comprises a documentation section for providing information related to the function, which is adapted for display via the graphical user interface.