# Menu menuPriority This menu is used for the `PRIO` field of all record types. It controls the relative priority of records scheduled with `SCAN=Event` or `SCAN=I/O Intr`, and also of records that use asynchronous completion. | Index | Identifier | Choice String | | ----- | ---------- | ------------- | | 0 | menuPriorityLOW | LOW | | 1 | menuPriorityMEDIUM | MEDIUM | | 2 | menuPriorityHIGH | HIGH | The number of priorities is set in various other places in the code too, so adding new entries to this menu will probably break the IOC build.