With WindowsIdentity, is it possible to figure out the user who is doing
the impersonating. For instance, if web.config is this:
<authentication mode="Windows"/>
<identity impersonate="true" userName="netuser" password="p"/>
and I log in as user "jmcleod", I can look at the Name property to
figure out that the user is impersonating "netuser" .. but how can I
figure out that the real user sitting at the keyboard is "jmcleod"?