How can you retrieve the computer name of the person running a report?

I'm coming up blank here...how can I identify the computer of the person running an SRS report?  If I query HOST_NAME() it gives me the host of the reporting server, not the person browsing.

So, for example, Melissa opens a browser from computer named AAA to the SRS and pulls up her report.  How do I get that report to show that the user is browsing from AAA?

Thanks!

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Number2 - (John Nelson)
Microsoft MVP - System Center Configuration Manager
http://number2blog.com