You can include TSO/E commands and subcommands (and user-written commands and subcommands) in a CLIST at any point where the specific functions (for example, allocate, free, and so on) are required. For certain applications, a CLIST might consist entirely of commands and subcommands. You can also substitute CLIST variables as operands in commands and subcommands, or as commands themselves. For more information about CLIST variables, see Using symbolic variables.