I have recently noticed that in Windows 10, double combo CTRL+ALT+L causes screen to lock, exactly like WIN+L.

I have noticed this happening since a while, maybe since 2004 update.

It is frustrating. I instinctively use the combo in IntelliJ IDEA to reformat files every time I finish editing them, but now the system intercepts the first combo and doesn't propagate it to IDEA.

Does anyone know how to disable this combo for lock screen?

Edit: seems like the situation is worse. I can't type @ on my keyboard, in particular with the classic combo Alt Gr+@ (ò). In fact, Alt Gr gets completely ignored even with euro key. CTRL+ALT serves as Alt Gr

I tried Spy++ but no process is stealing hotkeys

  • Why not turn it on its head, and change the key combination in IntelliJ? Jul 23, 2020 at 7:41
  • I use the combo instinctively since years. It took me a lot of time to learn IDEA combos Jul 23, 2020 at 7:43
  • 1
    You need to check who's stealing that shortcut because Ctrl+Alt+L is not mapped to Win+L in Windows 10
    – phuclv
    Jul 23, 2020 at 8:11
  • I tested Ctrl - Alt - Del with Windows 2004 Production and Windows 2004 5 or 6 months hence and Ctrl-Alt-Del the second time does not do anything more.
    – John
    Jul 29, 2020 at 22:09

2 Answers 2


Closing app Mouse without Borders fixed the ctrl alt l issue, but not the @/€ issue


Lock/Unlock all machines at once

Hit Ctrl+Alt+L twice to lock all machines. NOTE: If you use a Polish keyboard, Alt+L (to show up the 'ł' letter) would be eaten up in the remote machine so you would better change this hotkey to something else:)

  • 2
    No need to close the Mouse without borders app, just disable the Lock machine Shortcut in Settings>Other options
    – Kirill
    Jan 8, 2021 at 3:02

Maybe you can use AutoHotKey (Download from https://www.autohotkey.com/) for this:


First Save this as .ahk file and run it. Now CTRL+ALT+L hotkey will be disabled.

  • this doesn't solve the root cause. If AHK captures the key after it was hooked then it won't work at all
    – phuclv
    Jul 23, 2020 at 8:11

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