Why modifying tnsnames.ora

From: Dino Hsu <dino1_at_ms1.hinet.net>
Date: Fri, 26 Feb 1999 10:11:48 +0800
Message-ID: <36D602E4.AA42F0EE@ms1.hinet.net>

I re-installed Oracle client in Windows 95, the tnsnames.ora needs to be modified by adding the following lines, but I don't know why. Can anybody tell me the reason?
Thanks in advance, replace reply to my mail box.

PMDP_TW.WORLD =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 134.65.71.22)(PORT = 1521))
(CONNECT_DATA = (SID = PMDP))

)

TCP-LOOPBACK.WORLD =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(Host = 127.0.0.1)(Port = 1521))
(CONNECT_DATA = (SID = ORCL))
Received on Thu Feb 25 1999 - 20:11:48 CST