Apple Macintosh System 7.5 - Manual (Page 74)

Button Disabler
You can prevent other people from using the sound and screen contrast
buttons on the front of your computer by using the Button Disabler control
panel.
To disable the buttons, open the Apple (K) menu and choose Control Panels.
Then open the Button Disabler control panel.
Click the Disable Buttons box to put an X in it. The buttons remain off until
you turn them on again by clicking the box to remove the X.
For help
For information about items in the control panel, choose Show Balloons from the Guide menu
(marked with the
h
icon).
Telephone Manager
Your Macintosh has built-in capabilities that let you take advantage of
computer-telephone integration. Programs that support the Telephone
Manager can link software to telephone functions.
Multitasking support
The Thread Manager allows programs to integrate preemptive and
cooperative multitasking.
69 What’s New