Using a standard usb Cable to Connect 2 computers together will damage the computers?

Very possibly, YES IT WILL DAMAGE THE COMPUTERS. Beware USB A-A Male cables. Do NOT attempt to use these to interconnect 2 computers. They are only in existence at this point to connect very old first generation USB devices. At the time the spec either allowed or required the use type A connectors on both ends. The reason it doesn't work -- USB is designed to have 1 master only. A computer is a Master. If you connect 2 masters it will definitely NOT work and you may electrically short one or both machines. There are special USB A-A Male cables out there that will look a little different than you might expect. They'll likely have a bump or box of some kind in the cable or at one end or both end connectors. The intervening electronics are playing games with the signaling to make a connection, basically making the other computer appear to be a device not a computer. Also, usually there are specific drivers and/or software included with such a cable.