Example Linux has the following changes compared to HEPL .

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Added by putting in /sites/example/Updates/
These Java RPMS are not installed by default as /sites/example/base/comps* 
does not include them.  They can be installed via "yum" after
the system is rebooted.
The example-release is installed by default by adding it to /sites/example/base/comps*.
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Java

         j2re is just the runtime enviroment
         j2sdk is the runtime enviroment, plus compilers. So you do
         not need both of these.  Renamed these rpms so as to fit the 
	 RedHat rpm naming convention.
 
        j2re-1.4.2_02-fcs.i586.rpm
        j2sdk-1.4.2_02-fcs.i586.rpm

example-release-3.0.3-9.2.noarch.rpm

	Contains /etc/redhat-release which defines release name.
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Modifed by putting in /sites/example/Updates/
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Mozilla

	The latest stable release of mozilla was 1.5.  It was decided to
	include it because of it's features, such as stability and a
	spellchecker.  All of it's devel rpms were put into notsupported.

		mozilla-1.5-LTS3x.1.i386.rpm
		mozilla-chat-1.5-LTS3x.1.i386.rpm
		mozilla-dom-inspector-1.5-LTS3x.1.i386.rpm
		mozilla-js-debugger-1.5-LTS3x.1.i386.rpm
		mozilla-mail-1.5-LTS3x.1.i386.rpm
		mozilla-nspr-1.5-LTS3x.1.i386.rpm
		mozilla-nss-1.5-LTS3x.1.i386.rpm

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Installer changes
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It uses kernel-BOOT-2.4.21-9.0.1.EL.i386.rpm as the installer kernel by
putting kernel-BOOT-2.4.21-9.0.1.EL.i386.rpm in /sites/example/Updates/ .

The gui final install screen suggests that you go to www.cern.ch/linux for 
support:-)(Just a example)
This was done by getting the /iw/congrats_gui.py file from the anaconda SRPM
and modifying it and putting it in /sites/example/RHupdates/iw/ .  This is
only a example of changing the installer.