Private VPN for playing games or using other software as if two or more LAN's were connected.

Got sick of hamachi screwing out.
https://nwgat.ninja/quick-easy-tinc-vpn-between-windows-systems/

And if you want to play games that use IPX but dont want to install IPX use one of these to wrap it with UDP.
http://www.moddb.com/games/cc-red-alert-2/downloads/ra2yr-lan-fix-xp-vista-w7-x86-x64
or
http://www.solemnwarning.net/ipxwrapper/