UNSELECTED()
 Selects the unselected color value for SET COLOR TO output
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 Syntax

     UNSELECTED() --> cNull

 Returns

     UNSELECTED() always returns a null string.

 Description

     UNSELECTED() takes a color attribute designated by SET COLOR TO as
     unselected (fifth color value), and designates it as the active
     attribute for CA-Clipper @...SAY and ? output.  Use STANDARD() to switch
     back to the normal attribute.

 Example

     Output with the unselected attribute:

     ? "........"
     ? "........"
     UNSELECTED()
        ? "Different attribute!"
     STANDARD()
     ? "........"
     ? "........"