are legitimate programs that allow unauthorized access

are hacker programs that do not show up on the system

really do not usually work

usually are immediately discovered

is used for analysing paging problems

is used for analysing device busy problems

is used for analysing control-unit busy problems

is only shown on real-time displays

is more secure than end-to-end encryption

is less secure than end-to-end encryption

cannot be used in a large network

is used only to detect errors

should show any immediate performance problems

should show I/O, paging, and processor activity

need show only the I/O and processor activity

usually reports only on terminal displays

is good, since that means the device is in use

is bad, since that means the device is not available

is bad only if the device busy rate is too high

depends upon the system paging rate