![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/block-key-combinations3.png)
Control + Alt + Delete is a powerful key combination on Windows devices to terminate a running program/task or restart a computer/Windows device. Blocking this key combination becomes crucial when your Windows 7 or Windows 8 device is being used as a kiosk.
SureLock blocks this key combination with its Keyboard Filtering feature.
To block Control + Alt +Delete, follow the below-mentioned steps:
1. On SureLock Home Screen, tap anywhere 5 times within 3 seconds to launch the SureLock Password prompt
2. On password prompt, enter default password 0000 (four zeros) and tap/click on OK
3. On successful login, you will be on the SureLock Settings Main Menu
4. On Main Menu, navigate to Keyboard Settings
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Main-Menu.png)
5. On the Keyboard Settings screen, enable Keyboard Filtering.
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Keyboard-Settings.png)
6. Tap/click on Configure Keyboard Filtering to add/edit keyboard combinations that need to be blocked on the device.
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Configure-Keyboard-Settings.png)
7. On the Keyboard Filtering Configuration screen, tap on the Add Key button to add a keyboard combination that needs to be blocked
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Add-Key.png)
8. Select Delete from the Key drop-down box, check Ctrl and Alt checkboxes, and tap Add
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Keyboard-Settings-Prompt2.png)
9. In the Keyboard Filtering Configuration screen, click on Done
![](https://knowledgebase.42gears.com/wp-content/uploads/2020/08/SureLock-Keyboard-Settings-Blocked.png)
10. Make sure that the Keyboard Filtering check box is checked and then go back to the SureLock Home Screen
11. Now, the keyboard combination of Control + Alt + Delete is successfully blocked
Follow the same steps to block multiple key combinations and use SureLock’s Cloud Import/Export Settings to configure it on multiple devices.
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