With the IDL modify commands (See Modify commands), the IDL facility can be used to

• perform service functions in order to tune IDL facility behavior (see DABAPI and DUP)
• change or set a default group ID (see DEFGROUP)
• display level data of a specific module, modules, CSECT, or CSECTs (see SHOWCSECT and SHOWMODULE)
• display the level data of a predefined group of modules, as listed in the IOALSUM Summary Table (see SHOWGROUP)
• display level data (see SHOWLEVEL)
• perform service functions useful when monitoring an address space or when finding problems (see SHOWMEMORY)
• display a full list of tasks and modules currently running in an address space (see SHOWMODULES)
• display modules or CSECTs that cannot be identified (see SHOWSHORT and SHOWUNKNOWN)
• display level data snapshots (see SHOWSNAP)
• create level data snapshots and place them in storage by means of a modify command (see SNAP)