If you search around here you will find many other ways to potentially detect key loggers, frankly they are all involved & you may be better off erasing the OS & resetting all your passwords if you believe the machine is compromised.
If the Mac is left unattended in a public place anyone may be able to install software if the admin password is known. Unattended Macs should require a login password, be shutdown when left or have the screensaver set to require a password.
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