获取访问本地网络中的ASP.NET Intranet页面的用户的用户名

We have an ASP.NET intranet site, available to users who are either physically at and logged into a local machine or else to users who connect remotely via VPN. Is there a way to automatically get the username of whoever is accessing the page based on the name used to either log into the local machine or that used for the VPN?We have an ASP.NET intranet site, available to