Libraries provide a convenient means of storing client-side program
units and sharing them among multiple applications. Once you create
a library, you can attach it to any other form, menu, or library modules.
When you can call library program units from triggers menu items
commands and user named routine, you write in the modules to which
you have attach the library. When a library attaches another library,
program units in the first library can reference program units in the
attached library. Library support dynamic loading-that is library