There is a way in Lotus Notes 4+ to completely hide the Windows-standard menus at the top of the screen (File, Edit, Views, etc.). That way, you can actually prevent users from using the various commands available there. Instead, you force them to use your application's interface (for example, the only way to save a document is through your buttons which contain specific script).
You do not actually need to fill in any code or check any properties to hide the top menu in Lotus Notes. The way to do that is as follows:
1) Create/edit a form the usual way
Next time the user opens a document based on that form, he or she won't see the Windows menu within that form.
Note: to remove that feature from your form, just edit the form and once again hold control-shift-+ keys while saving. It's a simple toggle.