Library /sys$common/syshlp/helplib.hlb  —  CRTL  dlopen  Description
    The dlopen function provides an interface to the dynamic library
    loader to allow shareable images to be loaded and called at run
    time.

    This 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.
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