Returnstar net maintenance system AC: Administer card + lanctrl software As a network administrator, he has to maintain tens or hundreds of computers in their daily work. They have to update the software configuration each a certain time. They have to take a lot of time from making mother disk to make ghost disk. Sometimes they have to take several hours even several days to install a common application software. Not only the efficient is low, but also may affect the normal work. It is much harder for network cafe administrators, they may take several nights to maintain all of the computers. Returnstar net maintenance system can solve this problem. Maintenance hundreds of computer= maintenance one computer, it can greatly improve the maintenance efficient; reduce the maintenance cost of computer labs and internet cafes.