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A CPL identifier is any name. The name can represent a function, variable, reserved word, or data type.

Identifiers can contain any combination of letters, numbers, and the underscore character. However, an identifier can only begin with a letter. While the length of identifiers is not limited, Concordance will only consider the first 16 characters when comparing them.

CPL is case sensitive. Thus color, Color, and CoLoR constitute three different identifiers. Database field names, which are not case sensitive, are generally upper case to improve program readability.