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

                                                                   GLFINISH(3G)