| side
	  (const char *, input)	    Specifies the side of the viewport along which the text is to
	    be written. The string must be one of:
	     		  b: Bottom of viewport, text written
		  parallel to edge.
				  bv: Bottom of viewport, text written at
		  right angles to edge.
				  l: Left of viewport, text written
		  parallel to edge.
				  lv: Left of viewport, text written at
		  right angles to edge.
				  r: Right of viewport, text written
		  parallel to edge.
				  rv: Right of viewport, text written at
		  right angles to edge.
				  t: Top of viewport, text written
		  parallel to edge.
				  tv: Top of viewport, text written at
		  right angles to edge.
		
disp
	  (PLFLT, input)	    Position of the reference point of string, measured outwards
	    from the specified viewport edge in units of the current
	    character height.  Use negative
	    disp to write within
	    the viewport.
	  pos
	  (PLFLT, input)	    Position of the reference point of string along the specified
	    edge, expressed as a fraction of the length of the edge.
	  just
	  (PLFLT, input)	    Specifies the position of the string relative to its reference
	    point.  If just=0,
	    the reference point is at the left and if
	    just=1, it is at the
	    right of the string.  Other values of
	    just give
	    intermediate justifications.
	  text
	  (const char *, input)	    The string to be written out.
	  
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