--background-- : The default portname for MPRender is MPRENDER. This can be overidden by the PORTNAME parameter. However you should never need to address the port directly as all commands should only be run from PRESCRIPT scripts which will automatically use the correct port. If 'OPTIONS RESULTS' is on then when an error is returned then RC2 will hold a supplementary error (number or text). Shortened unique formats of commands can be used.