How to do "connect" in PL/SQL ?

Hi all
I want to select the 8i database from 11gR2 database.
So I created a middle DB running 10gR2 and made dblinks like below:
DB A(8.1.7) <- DB B(10.2.0) <- DB C(11.2.0)
Now I want select table t from 11.2.
I Can do from C:
connect id/pass@B
select * from t@A;
But I want it in PL/SQL.
How to do connect in pl/sql or there are any solutions?
Thanks.
Jia Lu

See Metalink Note 207303.1 for a compatibility matrix that details support for database links between database versions.

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