How to get the WindowsIdentity of the caller of my excutable?

From: Cindy Liu (CindyLiu_at_discussions.microsoft.com)
Date: 06/22/04 

Date: Mon, 21 Jun 2004 15:17:01 -0700

Hi Everyone,

I created my Windows service. I want to get the WindowsIdentity of the caller that calls my method in my Windows service. How do I do that?

Thanks in advance!!!
Cindy