There are four factors to consider when establishing your interest in event queue transition monitoring.

• The list must support keyed entries, specified by the REFOPTION=KEY parameter on the initial connect to the list structure.
• You must specify the VECTORLEN parameter on the IXLCONN macro to cause the system to create a list notification vector for your connection's use.
• You must specify a non-zero value for the EMCSTGPCT parameter on the IXLCONN macro to allow the system to set aside a percentage of the list structure's storage for use as event monitor controls objects that will be queued to the structure's event queues.
• You have the option of having a list transition exit for notification purposes.