Windows Add/Remove Programs what is Date Last Used?

In Microsoft Windows XP I can go to Control Panel and choose Add/Remove Programs.  Once the list is populated you can sort by different values.  One of the values is Date Last Used.  How is this date determined?  It never seems to relate to when I actually last used a product.  Also, how is the Frequency of Use determined.  Again, it never seems to relate to how often I actually use a product.  This has been a curiosity in the past, but I would really like to know, so that when others ask me I can give better advice and/or not make a bad decision if looking at someone else's PC.  Thank you!
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

This page seems to answer your question:

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
This should give you some insight.. 
you beat me to it :)
The 7 Worst Nightmares of a Sysadmin

Fear not! To defend your business’ IT systems we’re going to shine a light on the seven most sinister terrors that haunt sysadmins. That way you can be sure there’s nothing in your stack waiting to go bump in the night.

The add/remove programs is pretty much hopelessly inaccurate.  Your best bet to find last used is to go to the program's .exe file, right click on it and check it's "Accessed" time stamp.  There may be some third party stuff out there to track usage but it wouldn't be useful unless you had time to gather logs.
Oh hey nice link guys, disregard my thrid party statement.  
Just a side comment.

In many cases, the last used date is the date installed. As you can see from information in link above, the last used date is useless in nearly all cases.
richard_cristAuthor Commented:
I split the points since it was a photo finish.   :)
That link was possibly both the funniest and scariest thing I have seen.   :D
Thank you!
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows XP

From novice to tech pro — start learning today.