Holy cow, I wrote a book!
The first letter of the program is the accelerator and there's nothing you can do
about it. So if you have ten programs by Microsoft, they all use the accelerator "M".
(Yes I hate this too. The first thing I do after installing a Microsoft program is
go into the Start menu and delete the word "Microsoft" from the front.)
For Win32 menus, the ampersand character acts as the marker for the menu accelerator.
For example, you would set your menu text to "Save &As" to set Alt+A as the accelerator
for the menu item.