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!
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theProfessaConnect With a Mentor Commented:
This page seems to answer your question:
speshalystConnect With a Mentor Commented:
This should give you some insight.. 
you beat me to it :)
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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!
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