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 DBLBOX()    Puts a shadow-boxed Double Wide Box on the screen

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

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

 Example...: sv_scrn= DBLBOX( 04,10, 08,20, 2 )
             ... screen updates ...
             BOXREST( sv_scrn )