Real-time Programming Language
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Realtime Programming Language (RPL) is a compiled database programming language used on CMC/Microdata/McDonnell Douglas REALITY (databases, derived and expanded from the PROC procedure language, with much extra functionality added. It was originally developed under the name "PORC" by John Timmons and Paul Desjardine in about 1975. "PORC" was then further developed by Tim Holland under the employ of SMI in Chicago. A number of large scale manufacturing applications were developed in RPL, including that which was in use at Plessey/GPT limited in Liverpool and also the Trifid suite of manufacturing software.