Loading dblink.sql in Postgres 8.4

I found good article in dblink http://www.postgresonline.com/journal/archives/44-Using-DbLink-to-access-other-PostgreSQL-Databases-and-Servers.html, but got stuck on loading dblink.sql. Can anyone give me information on loading the dblink.sql into the database. I am using pgAdmin III on a Postgres version 8.开发者_StackOverflow4.

Thank you

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psql -d "database_name" < "dblink_location"/dblink.sql