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 ATT()       Change screen attributes without changing text

 Syntax....: ATT( tr,lc, br,rc, Attribute [,FillChr] )
 Parameters: <expN>: tr        = top row coordinate
             <expN>: lc        = left column
             <expN>: br        = bottom row
             <expN>: rc        = right column
             <expN>: Attribute = numeric color attribute for screen area
                                 (7=W/N, 15=W+/N, 31=W+/B, etc.)
 [optional]  <expC>: FillChr   = [optional] fill character (default:no fill)

 Returns...: nothing
 Cautions..: watch screen boundaries
 CC Calls..: none
 Alias.....: none

 Example...: ATT(00,00, 24,79, 15)   && Result: change entire screen to W+/B