In order to use a computer operating under Unix you need to ``log on''. This attempts to protect against unauthorized use of the computer equipment. It also lets each user define their own personalized working environment on the same computer and even work on the same computer at the same time. The basic Unix command for remotely logging onto a computer is rlogin (remote login). To log onto a computer type rlogin computername. You are then asked to enter your account name, password, and then (on some systems) your charge code. Workstation consoles, as well as x-terminals, are ready for your account name, password, and (again, on some systems) charge code. The rlogin command is not needed. The characters do not appear when you type your password to promote confidentiality.