In addition to passing return codes and variable values, you can define common variables to be shared among different CLISTs, or among subprocedures in a single CLIST.

Variables shared among different CLISTs are called GLOBAL variables. GLOBAL variables are defined using the GLOBAL statement, and are fully described in Nesting CLISTs.

Variables shared by subprocedures in one CLIST are called NGLOBAL (named global) variables. You define named global variables with the NGLOBAL statement. When you define an NGLOBAL variable, any subprocedure in the same CLIST can refer to it by name and modify its value.