Use of PLSExtProc and key EXTPROC in Oracle 10g

Hi Friends,
My listener file has the following values:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracleinfra)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = xyz.local)(PORT = 1521))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
My question is ?
What is the use of the Instance PLSExtProc and key EXTPROC?
Is it must to have the entry ,shall i remove the entry? what will be the implications if i remove the entries?Please suggest
Regards,
DB

Its used for external procedure calls like from Java and C. Its not a must and from the secuirty point of view, its actually a loophole. For more information, please read,
http://download.oracle.com/docs/cd/E11882_01/network.112/e10836/advcfg.htm#i443234
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17125/adfns_externproc.htm#ADFNS010
HTH
Aman....

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