CRTL, dlopen, Description
*Conan The Librarian
This function provides an interface to the dynamic library loader to allow shareable images to be loaded and called at run time. The dlopen function does not load a shareable image but rather saves its pathname argument for subsequent use by the dlsym function. dlsym is the function that actually loads the shareable image through a call to LIB$FIND_IMAGE_SYMBOL. The pathname argument of the dlopen function must be the name of the shareable image. This name is passed as-is by the dlsym function to the LIB$FIND_IMAGE_SYMBOL routine as the filename argument. No image-name argument is specified in the call to LIB$FIND_IMAGE_SYMBOL, so default file specification of SYS$SHARE:.EXE is applied to the image name. The dlopen function returns a handle that is used by a dlsym or dlclose call. If an error occurs, a NULL pointer is returned.