When I walk up to one of my locked desktops I type in the password and unlock the desktop. I would like to do the same thing remotely.
Immagine this: a friend is at my house and needs wants to play some awesome game on my computer; or perhaps they need to get something off the desktop or fix something, but the screen is locked!! I can A) tell them the password; B) change the password remotly; C) connect and unlock the screen for them.