Where can I find information about 'Level' and 'Opcode' shown under 'Details' of an event.
See below example.
How many levels and opcodes are there? What do they mean?

Thanks.

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Code:
- System 
  - Provider 
   [ Name]  Microsoft-Windows-Kernel-General 
   [ Guid]  {A69CA8B6-005F-D7B7-A798-03E1DE0F2F5D} 
   EventID 13 
   Version 0 
    Level 4 
    Task 0 
    Opcode 0 
    Keywords 0x8000000000000000 
  - TimeCreated 
   [ SystemTime]  2016-01-07T07:16:39.833372600Z 
    EventRecordID 7179 
    Correlation 
   - Execution 
   [ ProcessID]  4 
   [ ThreadID]  7940 
    Channel System 
    Computer DESKTOP-JFFLEA5 
    Security 
  - EventData 
  StopTime 2016-01-07T07:16:39.833372000Z
===