oid and oidvector

Hi!

I'm from Brazil, and sorry about my english...
I'm having problems with the oid field, the field present in all tables. I
wanted to use it as a foreing key betwwen too tables, but i couldn't! is it
possible??
what about the data type oidvector?? i didn't find any documentation about
it, i wanted to use it to keep a lot of oids of other objects... like an
array of foreign keys, you know?

could you help me??

thanks!

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