ClWIN() - Clear an area and attribute of screen
 Clears characters and attributes from a screen area
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 Syntax

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

 Arguments

     <nTop> is the top coordinate where the clearing should begin. The
     default is the cursor line.

     <nLeft> is the left column where the clearing should begin. The
     default is the cursor column.

     <nBottom> is the bottom coordinate where the clearing should end. The
     default is the last row of the current window.

     <nRight> is the right column where clearing should end. The default is
     the right column of the current window.

 Returns

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

 Description

     ClWin() is used to clear an area of screen with a "W/N" colour setting
     and a CHR(255).

 Notes

     ■  This function does not alter the cursor position.

 Examples

     ■  Clear from the cursor position to the end of the current window:

        ClWin()

     ■  Do the same from the top of the current window

        ClWin(0)

     ■  Clear from line 0, column 5, to the end of line 8 in the current window

        ClWin(0, 5, 8)


 Files:  Library is MRWINDOW.LIB.