All programming languages have a number of words that have special meanings in that language. These are known as reserved words and they can only be used in the appropriate parts of the programming code where they are intended by the language to be used. Trying to use a reserved word for something else will sometimes cause an obvious error and the rest of the time will cause a not so obvious error. Here is a reference to those words that have a special meaning in PL/1.

PL/1 Statement Reference

Tags: pl/1, reference, reserved words