This is for Windows 2003 sp2 in case that matters. I need to upgrade some existing instances from 11.1.0.7 to 11.2.0.3. I only have one sever to work with so my high level plan is as follows: 1. Install the 11.2.0.3 software. 2. Clone one of the existing 11.1.0.7 instances for testing by editing the output of "backup control file to trace" and using ordim to create a new Windows service. 3. Upgrade the test instance. 4. After appropriate testing, upgrade the production instances. This plan depends on my being able to control which ORACLE_HOME each instance uses. On my UNIX-based servers, /etc/oratab provides this function. How do I do this on Windows? Thanks, Peter Schauss -- //www.freelists.org/webpage/oracle-l