Possibly a semipermanent installation. Teachers - Classroom Usually used to keep track of student grades and show classroom presentations. If the computer is only used for keeping track of grades, creating tests and similar low end activities then there is no need for an extra large hard disk. If the machine is used for classroom presentations then a peripheral projection device will be necessary. Having the teacher's computer there in the classroom can be very handy.
Security becomes an issue however.
Unless students are never allowed to use the computer and the teacher is able to monitor physical access constantly someone may be able to access confidential student records. Located in the office the computer cannot be used for presentations and the teacher cannot update or view student grades during class. The average teacher will not make full use of whatever computer he or she gets. It is a good idea to consider reserving the better computers for those teachers best prepared to make full use of them. Faster, more memory, larger monitor, etc.