One day, the high-school teacher informed me that the computer system was running slower than normal. I asked the teacher when was the last time that the system has been rebooted. The teacher indicated that the system had been up for at least 5 weeks. It is important to note that a server should be rebooted on a periodic basis, since the computer system's performance may be affected by "'''zombie processes'''" (programs was that were completed, but still is considered running as a process with ID ) by occur, or "'''memory leaks'''" (unallocated memory due to poor programmingerrors) may affect the computer server's performance. I instructed recommended that the instructor teacher reboot the server once or twice a week, and ... that solved the problem...

By the way, I suspect one reason for the cause of the problem occured as a result of was that students were powering-off the their terminals (thin clients) instead of properly logging outtheir accounts...