TNSNAMES.ora setting problem

From: Allen <allen500_at_ms15.hinet.net>
Date: Thu, 25 Nov 1999 10:35:00 +0800
Message-ID: <81i77v$bju@netnews.hinet.net>

Hi,
Can anyone give me some idea about how to set TNSNAMES.ora & LISTENER.ora?

I created 2 DB Instance. Funny things occursed, I found 2 difference setting when I wanted to create database link using Connect String, one can create dblink by "Using 'xxxx'", but the other one must set to be "Using 'xxxx.world'", both DB configuration (init.ora, tnsnames.ora,listener.ora) I have checked is the same, but why I can not create dblinks using the same format connect string,

P.S.
Machine: SUN
global_names = False (initXXX.ora) Received on Wed Nov 24 1999 - 20:35:00 CST