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 CLEARSLOW()
 Deletes a screen area from the outside in with a delay
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 Syntax

     CLEARSLOW(<nDelay>, [<nTopline>], [<nLeftcolumn>],
        [<nBottomline>], [<nRightcolumn>],
        [<cCharacter|nCharacter>]) --> cNull

 Arguments

     <nDelay>  Designates the time delay in milliseconds for the
     individual steps in the delete procedure.  The value is in the range of
     1 to 65535.

     <nTopline>  Designates the line for the top-left corner of the area.
     The default value is the topmost line.

     <nLeftcolumn>  Designates the column for the top-left corner of the
     area.  The default value is the leftmost column.

     <nBottomline>  Designates the line for the bottom-right corner of
     the area.  The default value is the bottommost line.

     <nRightcolumn>  Designates the column for the bottom-right corner of
     the area.  The default value is the rightmost column.

     <cCharacter|nCharacter>  Designates the character to use to clear
     the screen.  The character can be numeric in the range of 0 to 255 or a
     character string.  The default is the character set using SETCLEARB().

 Returns

     The function always returns a null string.

 Description

     CLEARSLOW() clears a screen area from the outside in, step by step, with
     time delays.  You can designate the delay in milliseconds.  If the
     parameters for the area coordinates are left out, the function clears
     the entire screen.  In this case, the delete character set through
     SETCLEARB() is used.  The preset value is CHR(255).  CA-Clipper Tools
     uses this character because, in contrast to CHR(32), it accepts a color
     attribute on all screen adapters.

 Note

     .  If no screen coordinates are designated, the entire screen is
        cleared.

 Examples

     .  Use CHR(255) to clear the entire screen with a 50-millisecond
        delay:

        CLEARSLOW(50)                       // Always returns ""

     .  Clear an area with spaces and use a 10-millisecond delay:

        CLEARSLOW(10, 4, 4, 20, 76, 32)     // Delete character 32 (Blank)