The main building was a maximum security area with all posts alert at all times. It hosted a reader that could interpret Imperial secret codes that had been written to nava cards, among other types of memory circuits. The machine was fairly inaccessible; anyone wanting to access the terminal without authorization had to pass through a complex system of concentric circles, separated by gates that were controlled by switches on the outermost concentric corridor. Normally, Imperial Officers stationed around the perimeter would activate them remotely, providing fairly comprehensive security; one could not access the central core without first getting permission from the six security officers.