When using a Mac keyboard on a Windows system, there are some adjustments required for certain key combinations. Here's how you can perform the equivalent of Control + Alt + Delete on a MacBook keyboard connected to a Windows system: - Ctrl + Alt + Delete Equivalent on a Mac keyboard: - Press Fn + Control + Option + Delete to send the equivalent of Ctrl + Alt + Delete on a Mac keyboard. This should bring up the Windows Security screen on your Windows system. By using these key combinations on your Mac keyboard while connected to a Windows system, you should be able to invoke the same functionality as Ctrl + Alt + Delete.