verifying Oracle client install on Windows

[John Clarke <jclarke@xxxxxxxxxxxxxxx>]

We're in the process of using NAL (Novell Application Launcher) to perform 
Oracle client installations on desktops that we plan on deploying in our 
enterprise, and the first thing we want to do is check whether Oracle client 
software is installed on a machine.  If it is installed, the script will do 
nothing.  If not, it'll install a packaged Oracle client.

The Novell admin is looking for a single place and/or file to check for the 
existence of the Oracle client.  The users will have the liberty to 
install/de-install software on their own machines whenever they choose, and 
thus select the location for %ORACLE_HOME%.  Evidently, this NAL thing would 
like a single place to look in order to  validate.  We're targeting NT4, W2K, 
and XP.

I was thinking of looking in the registry, under 
HKEY_LOCAL_MACHINE/SOFTWARE/Oracle/ALL_HOMES.  Is this a good idea or the best 
place to look?  

Thanks in advance,

John

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