! Copyright (c) 1990-1997  Michael Sandrof, Troy Rollo, Matthew Green,
! and other ircII contributors.
!
! All rights reserved.  See the HELP IRCII COPYRIGHT file for more
! information.
!
Usage: WINDOW PREVIOUS
  Set the current window to the last numbered window
  swapping the current window with the new window if
  it was hidden.
