%N gretxt %F $MIR/src/gretxt.f
%D Erase text from graphics screen
%B
      SUBROUTINE GRETXT

 GRPCKG: Erase the text screen.  Some graphics devices have
 two superimposed view surfaces, of which one is used for graphics and
 the other for alphanumeric text.  This routine erases the text
 view surface without affecting the graphics view surface. It does
 nothing if there is no text view surface associated with the device.

 Arguments: none.
