How to get path from Oracle Forms 4.5 where Oracle is installed?

Hello,
My name is Petr Jarunek and I'm from the Czech Republic.. I have problem and i really don't know how to deal with it. Let me tell the problem.
I'm supposed to create button in Oracle Forms 4.5 which would run Oracle Discoverer 3.0. The
problem is that i can't just pass the path which is on my computer. For example, my path
would be c:\orant and somewhere else it would be c:\orawin or c:\orawin95...(depending on the
operating system - it's a client side). I don't know whether there's a way to get it from
ORACLE_HOME register in PL/SQL where the path is saved . If not, is there any way how to
get the path from forms or just anyhow? I'd appriciate your help. I feel like a desperate man.

 If you don't find the time to respond my mail - thanks for reading it anyway.
Petr

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