Thank you Albert for taking time to so thoroughly answer this question.  
There is more to this, however, since the solution you presented only works
for items that are enclosed within a "primary" ribbon, such as "Home".  I was
finally able to locate the information I needed by downloading the file,
"2007OfficeControlIDsExcel2007.exe" from the "Office Fluent Ribbon Developer
Portal", at address: "http://msdn2.microsoft.com/en-us/office/aa905530.aspx",
within the "Office Developer Center".  You can find this file by clicking the
link "2007 Office System Document: Lists of Control IDs".  There are several
other tools available there for developers who are interested in customizing
the "look and feel" of the ribbon in their applications.  Thank you, again,
for your kind response, and have a great day!