Mustek KB3100 - Manual (Page 23)

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d. Exit “hot key program m ing” mode
After the intended content of the key is completely entered, the
user shall press the “hot key” again to notify the end of “hot key
programming”. The programmable keyboard will give one beep to
signify the normal exit of the “hot key programming” mode. Should
there be any illegal entry in the content of the key or any other improper
operation during the programming, the programmable keyboard will give
three beeps to signify the failure of “hot key programming” and the key
content is not changed. If the user pressed the “Esc” key to abort “hot
key programming”, the programmable keyboard will also give three
beeps immediately as a response to signify the abort.