Yeah..

I was quite sure that this wont work, but we have been forced to try.. Not that much.. 😛
Normally the LAN is got over FTP and UTP cables, aka the twisted ones.. Yeah, the twisted wires.. Or even twisted pairs of twisted wires.. Cat6e has 6 twists per inch..
But using old 12 x 1.5mm² AC mains cable with no twists which is 20 to 30 meters long, is under ground and dated to late 70’s or 80’s must fail..or..?

why this could work?
1st: i used only 10Mb/s mode
2nd: we were totally lucky

update 2/2017: i will be finishing this project soon!

Last month i have been asked to code program to my work..
It took huge amounts of time.. but.. it was fun to hack Windoze 😀

what does it do:

• after starting Win7 and login to username the desktop is not showed & our IS is started and held fullscreen
• checks for our IS running, if its shutdown by user our app asks for pass or restarts it
• hotkey to invoke our login / logout to system with timeout of 10min to login again
• while user is logged in an unmovable & switchable window shows rest of time until next login window appears
• checks for instances of web browsers (IE, Opera, Chrome, Mozilla) and asks for pass to our login or quits them
• checks for instances of autoruns etc. and kills them so absolutely no way computer can be penetrated from local user
• switching keyboard language via hotkey or automated because our IS needs EN keyset
• is able to disable itself while certain user is logged in Win7 and enable again at logout
• verbose logging to both local and remote files over network
• ability to control TeamViewer QuickSupport executable and send its login over network  (dropped due to uncommon / unknown licensing until it gets clear)
• overlay debugging window via hotkey

recent version 1.7.1.0 source code has size of ~30kB