USE-ing f90VB Modules

Before you can call the procedures in f90VB’s Automation Library, you must USE at least two Fortran modules, f90VBDefs and f90VBAutomation. These modules contain constant and structure definitions, as well as interfaces to the procedures available in the library. In addition, the program in Example 6.1 uses variants, so the f90VBVariants module also needs to be loaded.