Oracle 11g compatibility with oracle 10g and 9i?

Hi All
I have some queries on 11g compatibility.
Is oracle 11g client compatible with oracle 10g client which is already installed on desktop?
If yes any changes to be done and where?
Is oracle 11g compatible with oracle 10g/9i on the same server where 10g/9i are installed?
Regards

Thanks Justin Thats right ...
Problem elaboration is as follows
We currently have an application which requires oracle 10g(10.2.0.3) client to connect to database from user desktops. As
part of new application development the oracle 11g clients need to be installed on all the user deskotps.
The complete application software along with oracle client 11g has to be roled out on these desktop as part of
implementaion of new application besides the existing application(The application software is packaged along with oracle
10g client).
We would like to understand if there is any software provided by oracle using which we can switch between different oracle
versions while accessing the respective applications simultaneously. Also are there any known bugs/issues in running
oracle 10g client and oracle 11g client together on the same user desktops with different oracle homes?

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