Can 10.1 and 10.2 database servers be installed on same machine?

This is probably a daft question, with the obvious answer of "of course you can't", but I'll ask it anyway.
We are currently running an Oracle 10.1g database server on a Linux machine (CentOS4 = RHEL4). The next phase of our development requires that we upgrade to Oracle 10.2g. However, we still need to be able to support our current release (uses OCCI) and we, obviously, need to provide for the ability to build patches. At the very least Oracle 10.1g include files and libraries must be retained.
I was wondering whether it would be possible to just install Oracle 10.2g on the same machine? The directory structures are product releated so both versions can co-exist. From viewing other forum discussions, I see that oracle will detect whether its default ports are already in use and suggest alternative ports to use. However, someone in our office (who has since left so I can't ask him what the problems were) has attempted to do this in the past without success.
I've looked at this machine (Linux - either RHEL4 or CentOS4) and all the services are using different ports, as expected. I suspect that one problem could be that both servers will attempt to use the same configuration files, eg /etc/oratab (although the system has been set up to use different oratab files).
Does anyone have any experience of installing multpile oracle servers on the same machine? Is it possible? Is it just a matter of making sure that you are talking to the correct listener when connecting to oracle, if multiple servers are installed?
Thanks for any information that anyone can give me.

Hi ,
It is possible to install multiple version of oracle on the same machine.
Only thing while installing you have to give the new home for oracle apart from that nothing else.
Even in oratab you can have multiple oracle_home.
Eg:-
~~
abcd:/opt/oracle/product/10.1.0/db_1:N
1234:/opt/oracle/product/10.2.0/db_1:N
zyxw:/opt/oracle/product/9.2.0/db_1:N

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Can 10.1 and 10.2 database servers be installed on same machine?

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