14. The unit as recited in claim 13 wherein said parser means identifies language keys for said first and second control languages and assigns each identified key a weight, said weights being summed for each control language to determine if a predetermined key threshold has been reached, said key threshold indicating the occurrence of a said language.
14. The unit as recited in claim 13 wherein said parser means identifies language keys for said first and second control languages and assigns each identified key a weight, said weights being summed for each control language to determine if a predetermined key threshold has been reached, said key threshold indicating the occurrence of a said language. 15. The system as recited in claim 14 wherein said first control language is PCL.