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 CLEARWIN()
 Clears a screen area
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 Syntax

     CLEARWIN([<nTopLine>], [<nLeftCol>], [<nBottomLine>],
        [<nRightCol>], [<cAttr|nAttr>],
        [<cCharacter|nCharacter>]) --> cNull

 Arguments

     <nTopLine>  Designates the topmost line where clearing is to begin.
     The default value is the cursor line.

     <nLeftCol>  Designates the leftmost column from which clearing is to
     begin.  The default value is the cursor column.

     <nBottomLine>  Designates the bottommost line to clear.  The default
     is the last screen line or window line.

     <nRightCol>  Designates the rightmost column to clear.  The default
     is the right screen border or window border.

     <cAttr|nAttr>  Designates the attribute to use to clear.  The
     default is the standard attribute CLEARA.

     <cCharacter|nCharacter>  Designates the character to use to clear.
     The default is the standard character CLEARB.

 Returns

     CLEARWIN() always returns a null string.

 Description

     CLEARWIN() clears a specified screen area.  This area extends from
      < nTopLine>  to <nBottomLine> and from <nLeftCol> to <nRightCol>.
     Without these parameters, the line and column that correspond to the
     current cursor position for <nTopLine> and <nLeftCol>, and the
     bottommost line and rightmost column are used for <nBottomLine> and
     <nRightCol>.

     You can clear with the standard attribute and character (CLEARA and
     CLEARB), or with the <cAttr|nAttr> attribute and the
     <cCharacter|nCharacter> character.

 Notes

     .  The <cAttr|nAttr> attribute and <cCharacter|nCharacter>
        character are specified in different ways.  Please refer to the
        Introduction of this chapter for more details

     .  The standard attribute and character are set with SETCLEARA()
        and SETCLEARB().

     .  If no parameters are specified for the line or column, the
        function automatically orients itself to the current cursor position.

 Examples

     .  Clear from the cursor position to the end of the line with the
        CLEARB character and CLEARA attribute:

        CLEARWIN()

     .  Do the same for line 23 from the current cursor position:

        CLEARWIN(23)

     .  Clear a window between line 23, column 15 and line 24, column
        70:

        CLEARWIN(23, 15, 24, 70)

     .  You can specify the attributes in different ways.  In the
        following three examples, the CLEARB() clear character is used.

        CLEARWIN(23, 15, 24, 70, 4)            // red on black<
        CLEARWIN(23, 15, 24, 70, "4/7")        // red on white
        CLEARWIN(23, 15, 24, 70, "B/W")        // blue on white

     .  Clear when specifying attribute and character:

        CLEARWIN(23, 15, 24, 70, "B/W", "+")   // blue on white