Code for servername of the application calling my app

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VB

Can anyone point me in the right direction for code to find out the servername from the application that called my app? I have a service that I wrote that runs on a server and when a file is put in a folder that it is monitoring it calls a VB app that resides on a second server. Once this application starts, I want to find out the server name of the service that executed it.

What I have tried:

I tried to search on google for it. I also tested my.computer.*** and my.application.*** and can't find what I'm looking for.