Windows gives the inbuilt ability to function as VPN server, although this option is invisible. It's exploits on both Windows 7 & 8. The server uses the point-to-point tunneling protocol (PPTP.)
This could be helpful for connecting to your home network with public network, playing LAN games with someone, or securing your network on a open Wi-Fi connection – a hardly of the many reasons you might need to apply a VPN.
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