Type this in tecnical’s terminal: xtightvncviewer -bgr233 -compresslevel 9 -quality 0 -listen
Type this in the user who need assistence: x11vnc -solid -noxdamage -speeds modem -nodragging -fs 1.0 -nosel -connect ip
Thanks to: http://www.karlrunge.com/x11vnc/faq.html#faq-slow-link