this is in essence the same thing as CTRL+ALT+DEL, it will display the login security screen where you can change the password, lock the computer, shut down, etc.
If you are doing RDP within RDP then this might work for you:
Press WindowsKey+R (or get the
Run box open) – then type OSK (It will open ‘on-screen-keyboard in your
remote-remote session). Or open on-screen-keyboard in different way.
Then press on your physical keyboard (not on that on screen!!) ctrl and alt
keys. Using your mouse tick DEL key on ‘On-screen-keyboard’.