1. A method of loading a library for an application program, the application program being run in a process supported by an operating system in a computer system, the method comprising the following steps, responsive to a library load instruction in the application program: a. determining whether it is the first library load instruction in the application program, b. if it is the first library load instruction, b1. loading the library in a first memory area, and defining a handle for the library, and a memory identifier to the first memory area, and b2. storing the handle and the memory identifier, for use in executing functions contained in the library.