Needs Clarification Regarding Listener.ora file

I want a clarification regarding listener.ora file I've Listener.ora file and its content look like as:
# listener.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\listener.ora
# Generated by Oracle configuration tools.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = Oracle8)
(SID_NAME = ORCL)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.10.10)(PORT = 1521))
I can understand every entry in this file accept the following
*(SID_DESC =*
*(SID_NAME = PLSExtProc)*
*(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)*
*(PROGRAM = extproc)*
*(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))*
Although rest of entries refer to network services(Database name) and host address and protocol etc.
what these above refere to.
Please clarify me in this.
Regards,
D.Abbasi

(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
that about External Procedure, If you don't use "External Procedure" you can remove it, by the way you should avoid default configure.
http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/advcfg.htm#sthref1331
http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/advcfg.htm#NETAG0132
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14251/adfns_extern_proc.htm#sthref1658
Sample create External Procedure:
http://surachartopun.com/2008/07/create-and-run-sample-external.html

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    Best regards,
    Desiree

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    Listener entry for the convenience when there is a switch over.
    Regards,
    Bala

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    859875 wrote:
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