The previous sections of this chapter discussed several basic ways to define and assign values to symbolic variables, using the SET, READ, and PROC statements. Other chapters describe how to use symbolic variables in more advanced applications with other CLIST statements:

• The GLOBAL, NGLOBAL, SYSCALL, and SYSREF statements let you define variables for use in nested CLISTs and CLIST subprocedures. See Structuring CLISTs for information about using variables with these statements.
• The I/O statements OPENFILE, CLOSEFILE, GETFILE, and PUTFILE use symbolic variables to send and receive input between files. See Performing file I/O for information about using variables with these statements.
• The LISTDSI statement uses a special set of CLIST variables for retrieving information about data set attributes. See Using control variables for information about this statement and its variables.