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 BOXSAVE()   Save a screen region, its coordinates, and size

 Syntax....: BOXSAVE( tr,lc,br,rc )
 Parameters: <expN>: tr = top row coordinate
             <expN>: lc = left column
             <expN>: br = bottom row
             <expN>: rc = right column

 Returns...: <expC>: 4 byte header + SAVESCREEN() string
 Cautions..: none
 CC Calls..: none
 Alias.....: none

 Example...: sv_scrn= BOXSAVE( 02,02,19,79 )
             ... screen changes ...
             BOXREST( sv_scrn )