windows+l Lock the screen to write command in the background ?

[Source_Writer]

Hey

I was thinking. If we ask to the USB RD to locked the screen, does the USB RD will be able to still open a GUI + r and write commands in background etc ? I mean :

DELAY 1000
WINDOWS L // lock the screen
GUI r // Does the USB will be able to open it or it will just write on the locked screen only ?
etc

In this way it will be very discreet but I really doubt it could works.

What do you think about "that" ?

[Source_Writer]

I just found this thread on the forum: http://security.stackexchange.com/questions/95576/bad-usb-attack-possible-while-screen-is-locked