Multiple Oracle Clients on Same Machine for different apps

I was not able to find info that answered this so sorry if I missed something that explains this.
At our site we have many applications some I know lots about some I'm not even aware of because we have mulitple sites. The application I develop uses an Oracle 8.1.7 database. In the next year we are going to be upgrading to a 9i database. The app I program for is written in VB and uses 0040 with the 7.3.4 version. We want to upgrade our client to the latest version to use all the features of the 9i database when that times comes. Can we have our 9i client on the same machine that may have other apps that require the 8i client or even the 7.3.4 client without breaking them? The other apps may or may not use 0040. Some of these apps are Oracle Forms applications and some can be anything under the sun.
I still need to do testing to see what breaks but thought someone may already have the answers some of my ?'s Any tips or info you can provide would be great.
Thanks

Two possible answers
1) Oracle added multi-home support to the Oracle client in 8i (may have been 8.0, I'm really not sure). This allows you to set up multiple 8i and above clients on a single machine in different Oracle Homes and should solve the majority of your problems. Having a 7.3.4 client installed wouldn't be supported, but 8i clients should have no difficulty connecting to a 7.3.4 database.
When Oracle added multi-home support, not all the Oracle client products were made multi-home compatible. The ODBC driver, for example, wasn't multi-home compatible until significantly later patchsets. I belive that OO4O has been multi-home compatible since the client has been, though.
2) From a technical standpoint, you should be able to have a 7.3.4 client alongside 8i and above clients. In my experience, this works, but isn't something that Oracle supports.
Justin

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