Connect from Windows Client to Oracle 10g for Windows 64-bit

Have an environment currently running Oracle 10g 32-bit on Windows 2000 Standard, and need to migrate to Oracle 10g 64-bit for Windows. Users connect to the 10g 32-bit database using the Oracle Client for Windows 10g loaded on remote PC's. If we migrate to the Oracle 10g 64-bit on Windows 2003 Server Enteprise Edition 64-bit, what type of client do I have to install on the PC's to access the Oracle 10g 64-bit database?
Any ehlp/insight will be greatly appreciated.
Eduardo in Michigan

In addition to install 32-bit Oracle client to 32-bit Windows OS, you need to know whether your application is compiled to run in 32-bit or 64-bit.
This is critical because 32-bit application can not see 64-bit Oracle ODBC and OLE DB provider.
For example, MS SQL Server 2005 uses 32-bit DTS, and SSIS, which needs 32-bit Oracle client
If you don't know, get a copy of both 32-bit and 64-bit Oracle client, and try one-by-one to know for sure. Please be aware that if regsvr32.exe in the Windows has been overwritten by older software installation, it won't register some DLL properly, and Oracle ODBC, or OLE DB won't show up as well

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Pl identify which exact version of 10g is being installed.
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Problem description
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