Source : Free On-Line Dictionary of Computing

plug and play
     
         1. Hardware or software that, after being installed
        ("plugged in"), can immediately be used ("played with"), as
        opposed to hardware or software which requires configuration.
     
        See also {turnkey}, {plug and pray}.
     
        2. A new recruit who needs no training.  "The new guy, John,
        is great.  He's totally plug-and-play."
     
        (1997-03-30)