What will happen if you click on lock this computer?

(This applies if you are using most versions of Windows that handle it)

If you click on "Lock this Computer" Windows hides all of the Windows, and the taskbar so that they cannot be accessed, and puts up a window asking for a username and passWord, if you type in the currently logged on account, then it opens it back up just how you left it, but if you type in an admin pasWord, it logs you off and goes to the welcome screen/login screen.