InvertWin() - Invert a colour string
 Inverts all attributes in an area of the screen
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 Syntax

     InvertWin( [<nTop>], [<nLeft>], [<nBottom>], [<nRight>]) --> cNull

 Arguments

     <nTop> is the top row coordinate. The default is the cursor
     position.

     <nLeft> is the left column coordinate. The default is the cursor
     position.

     <nBottom> is the bottom coordinate. The default is the bottom row of
     the active window.

     <nRight> is the rightmost column for the bottom-right corner of the
     area.  The default is the end of the screen area.

 Returns

     InvertWin() always returns a null string, or "".

 Description

     InvertWin() allows you to invert colour strings within a specified area
     of the active window. Colour attributes are swapped. Foreground colours
     are swapped for the back ground colours and the background colours
     become the foreground colours.

 Notes

     ■  This function does not alter the cursor position.

 Examples

     ■  Invert the attributes of the currently active window:

        InvertWin(0, 0, MaxRow(), MaxCol())


 Files:  Library is MRWINDOW.LIB.