How to find if user is running IE9 32-bit or 64-bit

I need to find out if users are using the 32-bit or 64-bit version of IE9 in a web app.

We can already tell which browser and version they're running, but for some reason, I haven't found how to tell the difference between 32 and 64 bit versions.  

Thanks!
quiTechAsked:
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bigeven2002Commented:
Are you wanting the web app itself to detect this or are you looking at it manually?  If manually, the Windows task manager distinguishes 32-bit apps by putting *32 next to the process name, so in this case, it would say iexplore.exe *32 if it was in 32-bit mode.

As far as the web app detecting it, this link may shed some light on it:

http://forums.asp.net/t/1725206.aspx/1?Test+for+Web+Browser+Version
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quiTechAuthor Commented:
Thanks!
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