Software application program interface method and system

A software application program interface system and method is provided. A call message may be received that specifies a type of application program to be called from a calling application program that is executing on a computer system. It may be determined whether the computer system has any application programs of the specified type available for execution. If an application program of the specified type is available for execution on the computer system, an application call message may be provided in a format recognized by a particular available application programs of the specified type, and the particular available application program may be called using the application call message.