Defining and Removing Identifiers

You can define and remove identifiers with the $DEFINE and $UNDEFINE statements. The $DEFINE statement defines an identifier that controls program compilation. You can also use it to replace the text of an identifier. $UNDEFINE removes the definition of an identifier. You can use the identifier to control conditional compilation.

Use the $UNDEFINE statement to remove an identifier defined by a previous $DEFINE statement from the symbol table. You can also specify conditional compilation with the $UNDEFINE statement.