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 SHADOWBOX() Clear & shadow box a screen area (draw border box optional)

 Syntax....: SHADOWBOX( tr,lc, br,rc [,btype [,cs [,fchr]]] )
 Parameters: <expN>: tr    = top row
             <expN>: lc    = left column
             <expN>: br    = bottom row
             <expN>: rc    = right column
 [optional]  <expN>: btype = box border line type: (default= 2)
  "      "                     0 for no line in border box
  "      "                     1 for single line in border box
  "      "                     2 for double line in border box
  "      "   <expN>: cs    = color of the shadow (7 = W/N (default))
  "      "                     (15 = W+/N, 31 = W+/B ,etc)
  "      "   <expC>: fchr  = fill character (to fill shadow with)
  "      "                     (default: no fill)

 Returns...: <expC>: the BOXSAVE() string
 Cautions..: none
 CC Calls..: ATT(), BOXSAVE()
 Alias.....: none

 Example...: sv_scrn= SHADOWBOX( 05,20, 22,60, 2,7,CHR(32))
             ... screen changes...
             BOXREST( sv_scrn )