Overview: Charles Moore created Forth in the 1960s and 1970s to give computers real-time control over astronomical equipment. A number of Forth's features (such as its interactive style) make it a useful language for AI programming, and devoted adherents have developed Forth-based expert systems and neural networks. Functions in Forth are called "words." The programmer uses Forth's built-in words to create new ones and store them in Forth's "dictionary." In a forth program, words pass information to one another by placing data onto (and removing data from) a "stack," a software structure in which the last element in is the first element out. Using a stack in this way (Forth's unique contribution to the world of programming languages) enables Forth applications to run quickly and efficiently.

Two groups of loyalists (the Forth Interest Group and the Institute for Applied Forth Research) help promote the language. Two lively books by Brodie (1984, 1987) are perhaps the best-known introductions to Forth, and an article by Sperry (1991) is a short, well-informed overview. Townsend and Feucht (1968) discuss Forth in connection with expert systems. The San Jose-based Forth Interest Group lists a number of independent developers who have build Forths for various platforms.

Glossary Link - Forth Programming Language

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