NAME
	  glFinish - block until all GL	execution is complete


     C SPECIFICATION
	  void glFinish( void )


     DESCRIPTION
	  glFinish does	not return until the effects of	all previously
	  called GL commands are complete.  Such effects include all
	  changes to GL	state, all changes to connection state,	and
	  all changes to the frame buffer contents.

     NOTES
	  glFinish requires a round trip to the	server.

     ERRORS
	  GL_INVALID_OPERATION is generated if glFinish	is executed
	  between the execution	of glBegin and the corresponding
	  execution of glEnd.

     SEE ALSO
	  glFlush