! 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: BIND <key> BACKWARD_HISTORY
  Replaces the contents of the input buffer with the previous
  command in the command history buffer.  The command history
  buffer is a circular buffer that wraps at the end.