NEC NP3151W - Manual (Page 59)

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4. Convenient Features
 Preventing Unauthorized Use of the Projector
Assigning a keyword prevents the projector from being used by unauthorized individuals.
Turning on the Security function by assigning a keyword for the first time
1. Press the MENU button.
The menu will be displayed.
2. Press the SELECT  button to highlight the [SETUP] submenu and press the ENTER button.
The page tab [BASIC] will be highlighted.
3. Press the SELECT  button twice to highlight the page tab [INSTALLATION(2)].