Below is a shot of the process running on Windows Home Server.     

       

If you try to end task on this process WHS will not let you.

If this file is corrupted or deleted from your computer, your going to have problems logging onto your machine.  The fix is usually pretty simple as I explained in my response here. 

Mysicgeek’s Tech Lingo:  Server – A Server is a computer designed to run specific Server Applications.  They are usually high powered machines that several client computers connect to.