The Ctrl+Alt+Del key combination can be forwarded from any NoMachine client to a NoMachine server host once you are connected to the remote desktop.

The steps are:
- connect to your NoMachine remote desktop
- press the Ctrl+Alt+End key combination to send Ctrl+Alt+Del to remote.

If you're connected from Windows, as an alternative to the shortcut:
- open the NoMachine session menu (Ctrl+Alt+0)
- click on the small icon in the right hand corner as illustrated

Ctrl+Alt+Delete will now be usable in the remote desktop.

TIP

You can change the 'Ctrl+Alt+End' shortcut for all connections: open the UI -> Settings -> Player -> Input. Then click on the Shortcuts button and eventually scroll down the list to find it. To change it only for the current session, open the NoMachine menu panel inside the session (ctrl+alt+0 or click on the page peel in the top right corner of the window) -> Input -> Shortcuts.

On mobile app you don’t need to use the menu: open the OnScreen keyboard (or press the toolbar icon if you’ve a physical keyboard) and use the extended bar to press Control, Alt and Delete. It’ll trigger the Secure Attention Sequence on the server to unlock the screen.