So I've run into a dead-end problem. we're trying to publish Aloha POS (http://www.alohapos.com <http://www.alohapos.com/> ) through Citrix and everything was going fine till we tested for multiple users running the app. Problem is, APPARENTLY the client application sets up port 139 so the server can communicate with it anytime it needs to. So evidently the first instance of the app loads, but just as a second user tries to launch the app she gets the error "Cannot register station. 0xD", I'm guessing because port 139 is already taken, but it is still a wild guess. If that is the case, I ran out of ideas to work around this problem, so any help would REALLY be appreciated. Thanks a lot, Carlos Sanabria, MCSA, CCA IT Consultant