How to Lock an Acer Monitor
- 1). Click the "Start" button at the bottom left of the Windows taskbar.
- 2). Click "Control Panel" and then double-click "User accounts."
- 3). Click your user account and then click "Create a password."
- 4). Enter a desired password and click "OK" to save changes.
- 5). Press the "Ctrl-Alt-Del" keys simultaneously and then click "Lock Computer."
Source...