A method is included for loading a main loadable file and at least one optional loadable file during initialization of a computer system. The method includes loading a main loadable file which includes a resident portion and an input/output network interface software component. The resident portion is a utilization software component configured to use transmission protocols. The method also includes determining which optional loadable files are required to be loaded. The optional loadable files each include an optional portion. The method also includes loading the optional loadable files which contain optional portions corresponding to required protocols.