Can someone talk about OwnerId and OwningTeam of the Incident table/entity?

Would someone talk about the OwnerId, OwningTeam, and OwningUser of the incident table?

OwnerId             writeable attribute

OwningTeam      read-only attribute

OwningUser       read-only attribute

Q1: How, what does dynamics do OOTB, to set the ownerid when an incident is created?  

Q2: What part do the OwnerId, OwningTeam, and OwningUser play when it comes to what permissions govern accress to the incident record? 

Q3: In a background process there is a check box for trigger  "Record is assigned".  Which field does this trigger use?

sorry to be all over the place..

Thanks, DJ

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