Sending Ctrl + Alt + Del from a Mac to a Windows PC can be tricky because macOS keyboards treat the "Delete" key as "Backspace," and the operating system often intercepts the command.

Here are the most reliable ways to send the command, depending on the software you are using.

1. The Keyboard Shortcut (Microsoft Remote Desktop)

If you are using the official Microsoft Remote Desktop app, use this specific key combination. You must hold down the Fn (Function) key to convert the Mac "Delete" key into a Windows "Delete" key.

Press and hold in this order:

Note: The "Option" key acts as the Windows "Alt" key.

2. The Menu Bar Method (Microsoft Remote Desktop)

If the keyboard shortcut isn't working or interacts with macOS instead, use the built-in menu function in the Remote Desktop app.

1. Move your mouse to the top of the screen to reveal the Mac menu bar.
2. Click on Connections.
3. Select Send Ctrl+Alt+Del.

3. Chrome Remote Desktop

Chrome Remote Desktop does not typically accept the standard key combination. You must use the sidebar menu.

1. Click the small arrow/tab on the right side of the screen to open the session options.
2. Scroll down to the Input Controls section.
3. Click the option labeled Press Ctrl+Alt+Del.

4. TeamViewer or AnyDesk

Third-party support tools usually have a dedicated button in their toolbar, as they block key passthrough by default.

• TeamViewer: Go to the toolbar at the top Actions Send Ctrl+Alt+Del.
• AnyDesk: Click the Lightning Bolt icon in the toolbar Select Ctrl+Alt+Del.

5. The "On-Screen Keyboard" Workaround (Universal Fix)

If none of the above work, you can trigger the command visually from within the Windows environment.

1. Open the Start Menu on the remote Windows computer.
2. Type osk and press Enter to open the On-Screen Keyboard.
3. On the virtual keyboard, click Ctrl + Alt + Del with your mouse.

On a MacBook, the key labeled "delete" is located in the top-right corner of the main keyboard area, directly above the Return/Enter key.

However, there is a crucial difference in how this key works compared to a Windows PC:

• Mac "delete" = Windows "Backspace": By default, the key on your Mac deletes text backward (to the left of the cursor).
• Windows "Del" = Mac "Fn + delete": The Windows Ctrl+Alt+Del command requires a "Forward Delete" (deleting text to the right of the cursor).

How to trigger the Windows "Del"

To get the specific "Del" signal needed for the Ctrl+Alt+Del shortcut, you cannot just press the physical delete key. You must modify it:

1. Locate the Fn (Function) key in the bottom-left corner of your keyboard.
2. Press Fn + delete.

This combination turns the Mac's "Backspace" into the "Forward Delete" required for the remote session.

Summary for your Shortcut

So, the full physical combination on your MacBook keyboard is: Fn (bottom left) + Control + Option + delete (top right)

You are absolutely right. In the world of Windows, the key labeled "delete" on a MacBook is functionally a Backspace key-it deletes text to the left.

This is the main source of confusion when sending commands to Windows.

The Missing Key

Windows keyboards typically have two distinct delete keys:

1. Backspace: Deletes backward (left).
2. Delete (Del): Deletes forward (right).

MacBooks physically only have the first one. The Windows Ctrl + Alt + Del command is strictly listening for that second type of delete-the "Forward Delete."

How to fake it

Since the physical key is missing, macOS uses the Fn (Function) key to change the behavior of the button.

• Pressing delete alone: Sends "Backspace" (Windows ignores this for the command).
• Pressing Fn + delete: Sends "Forward Delete" (This is what Windows is waiting for).

So, when you are pressing the combo Fn + Control + Option + delete, you are technically telling the computer: "Press Control, Alt, and convert this Backspace button into a Forward Delete button."