Can mountain lion be installed on external disk and lion remain on internal?

I have an app that I need that is not ready for Mtn Lion, can I load Mtn Lion on an external disk and boot it or Lion on internat?

It sounds like you're question was already answered, but for the sake of people who want to know how to install to an external, here's a link http://www.makeuseof.com/tag/install-osx-lion-external-drive-test-mac/ .
- Luke

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