A computer system and method is disclosed that aids in training system administrators. Users can access the system administrator tool over a secure network, and through the system administrator tool can initiate various offensive and defensive operations against training computers on an isolated network. The system allows one or more users to remotely administer real applications and operating systems on the isolated training network to acquire experience and skills to secure a network from attack. Multiple users, such as a student and an instructor, can establish a communication link to communicate with each other during the simulated attack and defense of the test network.