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  Argument
 
    x1, y1    Column and row coordinates for the upper-left corner
 
    x2, y2    Column and row coordinates for the lower-right corner
 
  Description
 
    The Window procedure sets the current window to new coordinates
    and moves the cursor to the upper-left position in the new
    window.
 
    The coordinates are positive integer values relative to the screen
    display, not the current window. The coordinates for the maximum
    window (the full screen) depend on the number of columns and rows
    in the current mode for text display. The TextMode procedure sets
    the text mode.
 
      Mode Size    Maximum Coordinates
      ═════════    ═══════════════════
 
      40 x 25      ( 1, 1, 40, 25 )
      40 x 43      ( 1, 1, 40, 43 )
      40 x 50      ( 1, 1, 40, 50 )
      80 x 25      ( 1, 1, 80, 25 )
      80 x 43      ( 1, 1, 80, 43 )
      80 x 50      ( 1, 1, 80, 50 )
 
    In any mode, the point (1,1) refers to the upper-left corner of a
    window. A window can be made as small as one row by one column.
    Window ignores the call if the arguments are not valid coordinates.
 
    After Window sets the coordinates, the following routines operate
    relative to the new window:
 
      ClrEol   ║  Readln
      ClrScr   ║  WhereX
      DelLine  ║  WhereY
      GotoXY   ║  Write
      Insline  ║  Writeln
      Read     ║
 
    The variables WindMin and WindMax, defined in the Crt unit, always
    contain the current window coordinates relative to the full screen.
    The stored coordinates may be the default coordinates or may be set
    by a prior call to Window.
 
    Writing to the new window overwrites any previously written text
    within the new window. When new lines are added to the bottom of
    the window, all text within the window scrolls upward. Text
    scrolling off the top of the window is lost. Text outside of the
    window is undisturbed.