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MARK_WIND()                                                         C_DEMO
   Marks or unmarks all objects within a defined window.

   Syntax
         MARK_WIND(nType [,nXStart,nYStart,nXEnd,nYEnd])

   Arguments
         nType       Defines how the objects are to be handled.
                     0 = unmark all objects in window.
                     1 = mark all objects totally inside the window.
                     2 = mark all objects passing through the window.
         OPTIONAL PARAMETERS
         nXStart,
         nYStart     Sets the X,Y coordinate of the top left corner.
         nXEnd,
         nYEnd       Sets the X,Y coordinate of the bottom right corner.

   Returns
         None

   Description
         MARK_WIND() marks or unmarks all objects in the window according to
         the nType parameter. If no window coordinates are passed, coordinates
         from the previous mouse-drawn box are used (see example below).

         A 'marked' or 'tagged' object is one that is selected for group
         operations, such as combining, breaking, deleting or changing colors.
         An object is identified as being marked by its color or, in
         monochrome mode, by square marks at each intersection and midpoint of
         lines.

   Examples

         Marks all objects within the mouse-driven window.

         SET_LN_PAT(0,1)         && Set line pattern to broken line
         MS_OBJECT(4,7,0,0)      && Define window with mouse
         MARK_WIND(1)            && Mark all objects totally inside window