Xerox 450c - Manual (Page 160)

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Enabling security
You need to select the Enable security option if you want
to receive your faxes to memory and forward your faxes to
another fax machine. After you enable security, you must to
enter your password each time you click Settings in the
WorkCentre 450c Status window and when you use secure
features at the WorkCentre.
1. At your PC, double-click the WorkCentre icon.
2. In the WorkCentre 450c Status window, click Settings.