Command-line (cmd) command to lock a windows machine

I've been warned that this isn't recommended (except by Microsoft). The warnings are also centered around the command's close relative, ExitWindowsEx (Which shuts down the computer). I've never had any issues with it, but YMMV. Schlump: The poodle-monkey may be right. The legend warns that the code is powerful and dangerous. Nudar: My God. We'd better use it only three or four times. Six, max. Nibbler: But even a single use could shatter the universe! Nudar: Got it. Two or three times. (Source)