Is it possible to run two Mac operating systems at one time?

I am running snow leopard on my MacBook but have an older version of Photoshop that can only be run on tiger. Tiger is already installed on an external hard drive so I could just boot up into that bit would like to save some time. Is there software that allows simultaneous running of mac OS like parallels desktop does for windows on Mac?

It would seem reasonable that you might be able to do it.. use Disk Utility to create a new partition for the other MacOS and install it to that partition. You will treat each partition as a separate disk, and select the boot disk thru System Preferences. But this approach treats them as separate OS installations requiring separate boots and cannot be run simultaneously.
I opened Parallels 6 on my machine and noticed Parallels will allow you to create a Virtual Machine with another OS and not just Windows. I think you'll have to install MacOS from scratch though using the install MacOS DVD. I haven't tried this approach but it seems like it might be succesful. Not sure what happens when Parallels "translates" between MacOSs though.
I don't think you can use Carbon Copy Cloner to install a MacOS to a Parallels Virtual Machine though.

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Anyhow, thank you for your support, I will try to do some reading on the keywords you used, I might get back to you for some more leads!
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Is it possible to run two Mac operating systems at one time?

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