How can I grab NT username from a jsp page?

I have a requirement to grab the user's NT username using a jsp page.
I thought about using JAAS NT module samples, but I would need an application running on the client to do this (not a webpage). Then I thought about using an applet, but then read that an applet cannot read the username (not even a signed applet).
I know that Request.ServerVariables() in ASP and IIS, returns the NT domain and username. I'm using ATG Dynamo and iPlanet. I'm wondering if this can only be done through webserver variables. Would iPlanet have this?
Thanks for your assistance.
-AJD

I can think of no way to accomplish this goal through the JSP/Servlet API. That type of information is not broadcasted via HTTP, so any server-based resource that captures it is probably interfacing with some client application. I know nothing about ASP, but suspect that it is only able to capture the user names by interfacing with some application that is hidden to the client- that is, I doubt it is using HTTP. Some thing will probably have to be installed on the client machine to capture this information.... ...it would seem to me that the only legitimate need for that information would be for authenticating intranet users. Can't each user just be assigned an application ID that is equivelent to their NT ID?

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