To use a Designer menu, you must open a library file, read in the menu form, and then close the library file. The function that reads in the menu resolves all the references to external variables (if you wish) and returns a pointer to the menu. You can then use the pointer to the menu in any of the Vermont Views functions taking a menu pointer.
The fastest way to get a working prototype of your application is to use the Main Generator included in the Designer. The main() program that is generated automatically includes all the necessary header files, opens the correct Designer library, and reads in the main menu and any associated forms, such as branching sub-menus or linked forms. It then calls mn_proc() to process the main form. See the Designer User's Guide for more information on how to do this.