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SEQUENCE primary key

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Hello

I have a question, if I have a table with a SEQUENCE primary key, that obviously, I doesn't give in each new row inserted. For example if the table locks:
 CREATE SEQUENCE id_seq;
CREATE TABLE table ( id integer DEFAULT nextval('id_seq') CONSTRAINT table_id PRIMARY KEY,
   arg1 integer,
   arg2 integer
 )

How can I know which id receive each new row. I mean, <http://ultralingua.com/onlinedictionary/index.html?action=define&ignoreaccents=on&wholewords=on&searchtype=stemming&text=sudden&service=english2spanish> suddenly I insert one row (*) with the arg1 and arg2 . So ..., there are something that I receive back ?? Some pointer, something? There are any way to know which number receive my row ?

Thank you,
  Gustavo

(*) This process can be multi-thread. In my case I use the libraries with the wxWidget project with the class wxDbTable.


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