I'm working on a "calculator" program that my company wants to distribute to
customers. They chose to have me create this as an add-in to Excel.

If I save a workbook with VB code as an add-in, how do I get it to be loaded
every time I open Excel?

In greater detail--I have a workbook that I've got some code in it to add a
menu to the title bar, but I want it to be there every time I open Excel, not
have to go to Tools-Add Ins-Install every time in order to get the menu to
appear.

How do I structure this so that it can be installed on any machine?

(I'm using XP, Excel 2002)