The concept of peer to peer and multiple people having access to the same files is a bit of a nasty rabbit hole to start digging with more and more users accessing..as cfs111 said set up a networked pc as a Server. have it on during specific hours (ie 23 hours a day so it can be backed up etc) and share the same world files in real time to anyone logged on.. just needs a good reliable internet connection. zero wiz bang graphics cos thats all client side stuff (edit :oh it doesnt even need screen or keys once its set up either)