Someone else set up my eclipse environment. I would like to know which of the many Oracle instances available it is pointing to and change the password it is using. Where can I find this in Eclipse? Can I point to two Oracle instances at the same time? How hard is it to switch back and forth?
Eclipse itself doesn't talk to databases. So you don't set up "Oracle connections in Eclipse". The database connections have to be made by the projects that talk to databases.
If you have a database support plug-in that allows you to browse and manipulate database data and schemas, that plug-in would typically have its own mechanism for defining the connections to the databases it allowed you to browse and manipulate, but the exact process would depend on what database plug-in you're using. There's no universal definition.
Customer surveys are for companies who didn't pay proper attention to begin with.