You can create your own macro variables, change their values, and define their scope. You can define a macro variable within a macro, and you can also explicitly define it as a global variable, by ...

After a macro variable is created, you typically use the variable by referencing it with an ampersand preceding its name (&variable-name), which is called a macro variable reference. These references ...

For long-running programs, we want a way to check key issues as the program runs and to kill the program if there is any of these pre-defined issues is determined to be a problem. For example, if you ...