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INTRODUCTION

  If you have sufficient memory, it is possible to open up to 255 windows
  using the functions described in this chapter.  The numbers for the
  windows be between 0 and 255 inclusive, where window 0 designates the
  "normal" screen.

  Most functions will return the number of the selected window if the
  execution is successful.  If an error occurs the functions will return -1.

  The portion of the screen written to (when opening a new window) is
  automatically saved.  All settings of the current window are also saved.
  These settings include the cursor position, cursor shape and color
  attributes.  Since Clipper Tools One handles this automatically, it is
  not necessary for you to save the current settings of a window separately.

  It is possible to shift a window on the screen with the cursor keys and
  the Home and PgUp/PgDn keys when Scroll Lock has been activated.  The grey
  Plus (+) key in the numeric key pad acts as the WCENTER() function i.e., a
  partially visible window will be made fully visible.  The escape key cancels
  this, and restores the previous setting prior to the Scroll Lock operation.
  The screen coordinates used in Clipper will always be in relation to the
  current window when using window functions.

  All screen output is relative to the current window when activated.  This
  applies to both external programs, called via the RUN command, as well as
  to any external objects (C or ASM), provided that the output of these
  programs are via DOS or BIOS calls only.  The Scroll Lock functions
  described above will also be retained.  However, it is possible to switch
  off this ability.  Please refer to the "Expanded Driver" section for
  information on how this is achieved.