wooooow Thanks a lot it really helped you saved a week of searching. so i’ll use each dedicated server as a session (and that actually will fixes a a huge amount of complexity ) again thank you for all your information and your time . can you name all the services that you know ? things like SpatialOs ? and how can i run several dedicated server on one PC ? i haven’t test that but as long as each pc has its own IP if several dedicated server runs on one pc all of them will be in one IP . correct ?