If you do much work with the Oracle database on Windows, and you have 1+N Oracle homes installed, you've probably lamented the fact that the Oracle Home Switcher is no longer included with Oracle.
I can't recall exactly what the tool was called or which version Oracle was at when it ceased to be a part of the installation. I do know that it doesn't work with 10g+.
A little tool called Oracle Locater Express fills this niche nicely, and it does work with 10g. Sorry, have not yet tried it with 11g.
"Oracle Locator Express"
I've used it for several months without issue, save one minor glitch.
Sometimes Oracle 10g Homes are not displayed properly in the list of Oracle Homes to choose from. Other than that, no complaints