Starting with OS/390® Release 9, XES list services provide additional functions to the IXLLIST macro. Some, but not all, of these new functions require that the list structure be allocated in a coupling facility of CFLEVEL=9 or higher. The new functions, available through the IXLLSTE, IXLLSTM, or IXLLSTC macros, are:

• A list structure user can specify that a program-specified entry identifier will be used to reference a list structure entry as opposed to a system-generated entry identifier.
• New key comparison functions have been added for both single and multiple entry request types.
• List monitoring functions provide more granularity within a range of list entries being monitored.
• Secondary keys can be used to identify a list entry.
• New request types provide more efficient methods of deleting entries from a list and for processing an input list of entries either by changing the key value or moving the entry to another list.
• A list structure user can specify that 64-bit storage is to be used for data buffers.