Move window from a disconnected second screen

How many times have you disconnected a second screen and taken your laptop offsite, only to find out that the windows are opening on the other screen!

Try this:-

 Hit 'Alt+Spacebar'. This activates the tools for that window. Then hit 'M' for move.

Use your arrow keys and you can move the window back to the screen.

Once you know the trick, it's easy.

The real trick? Just knowing the trick.