Xerox -05W - Manual (Page 202)

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Initialization Commands
In some cases it may be necessary to disable the copy and paste function of the mouse
buttons to prevent accidental editing. This can be achieved by using one of these
commands.
When the editing functions are disabled, use the Edit menu options or the numeric
keypad keys Shift + . (i.e. Del) to copy and Shift + 0 (i.e. Ins) to paste instead.