Is there a way to get a table's primary key in V11

In pre-V11 I used a convention to flag a field as Primary Key: any  
field with indexed+unique+nonenterable+nonmodifiable+displayonly  
attributes is a PK for me.

In V11 I want to use a different combination: autoincrement+unique ==>  
PK.

I checked the documentation and could not find a way to get the 'auto  
increment' field attribute.
Neither Get Field Properties nor Get Field Entry Properties returns  
that attribute.

Does anyone know a way to get that info? Is it available in the System  
Tables, accessible via SQL?

TIA
julio

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