A traditional way to handle the problem of system compatibility uses command translation software in which the translation routines are fixed and virtually impossible for a user to add or update. Moreover, in the case where a new system is to be added, new translation software will be required;The virtual operator research proposes a way to implement an expert system with human-like capability, learning communication techniques from human experts and letting users without significant computer background communicate with different systems as desired. The virtual operator has been trained and is capable of communicating with NAS9160/WYLBUR, VAX/VMS and VAX/UNIX.