Realtime Programming Language (RPL) is a compiled database programming language used on CMC/Microdata/McDonnell Douglas

McDonnell Douglas

McDonnell Douglas was a major American aerospace manufacturer and defense contractor, producing a number of famous commercial and military aircraft. It formed from a merger of McDonnell Aircraft and Douglas Aircraft in 1967. McDonnell Douglas was based at Lambert-St. Louis International Airport...

 REALITY (databases, derived and expanded from the PROC procedure language

PROC procedure language

PROC is the name of Pick operating system's procedure language. PROC is comparable to a UNIX shell script or a DOS/Windows batch file, and has similar features such as control-flow constructs, file manipulation, subroutine calls, and terminal input and output. The PROC language itself consists of...

, with much extra functionality added. It was originally developed under the name "PORC" by John Timmons and Paul Desjardins in about 1975. "PORC" was then further developed by Tim Holland under the employ of George Ridgway's company SMI in Chicago. A number of large scale manufacturing applications were developed in RPL, including that which was in use at Plessey

Plessey

The Plessey Company plc was a British-based international electronics, defence and telecommunications company. It originated in 1917, growing and diversifying into electronics. It expanded after the second world war by acquisition of companies and formed overseas companies...

 and GEC-Plessey Telecommunications limited in Liverpool

Liverpool

Liverpool is a city and metropolitan borough of Merseyside, England, along the eastern side of the Mersey Estuary. It was founded as a borough in 1207 and was granted city status in 1880...

and also the Trifid suite of manufacturing software.