[GENERAL] OID

[Clark Evans]

I'm designing a database schema and have questions about OID.

First, I assume that OID are system assigned? [yes]
Second, Can I use OID as a primary key? [no]
Third, Is the OID invariant under an import/export process? [no]
Fourth, Can I create table with an OID type for referencing another
table? [no]

I puy my assumed answers in brackets.  Please let me know if I 
am mistaken. 

Thanks!

Clark