Scope of SET symbols

The scope of a SET symbol is that part of a program for which the SET symbol has been declared. Local SET symbols need not be declared by explicit declarations. The assembler considers any undeclared variable symbol found in the name field of a SETx instruction as a local SET symbol.

If you declare a SET symbol to have a local scope, you can use it only in the statements that are part of either:

The same macro definition, or
Open code

If you declare a SET symbol to have a global scope, you can use it in the statements that are part of any one of:

The same macro definition
A different macro definition
Open code

You must, however, declare the SET symbol as global for each part of the program (a macro definition or open code) in which you use it.

You can change the value assigned to a SET symbol without affecting the scope of this symbol.