Zenith Data Systems Z-171 PC Series Service Manual page 41

Page 3-11
Operation
Control Keys
Figure 3-8 shows the control keys which are used in combination with
other keys to perform a desired function.
The ESC key is used to stop the execution of a program, or to perform
special functions when pressed with another key.
The CTRL key is used to perform special functions when pressed at the
same time as another key.
The ALT key is used to enter special commands when pressed at the
same time as another key.
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Figure 3-8: Control Keys