There are the following groups of event services:
| Group | Elements |
|---|---|
| Global event services | Call_Global_Event, Cancel_Global_Event, GlobalEventCallback, Schedule_Global_Event |
| VM and thread event services | Call_VM_Event, Cancel_Thread_Event, Cancel_VM_Event, EventCallback, Schedule_Thread_Event, Schedule_VM_Event |
| Priority event services | Call_Priority_VM_Event, Cancel_Priority_VM_Event, PriorityEventCallback |
| Restricted event services | Call_Restricted_Event, Cancel_Restricted_Event, RetrictedEventCallback |
| Miscellaneous event services | _AtEventTime, Register_PEF_Provider |