Can I run Snow Leopard on my iMac + OS 10.4 as startup on external FW HD?

My iMac is running Snow Leopard.
I want to install OS 10.4 on an external FW HD and use that drive as startup to run older mac software (Canvas, etc.)
Can I do this? How? Snow Leopard won't let me install an older version of OS.
Thanks

Can I do this?
Only if your computer shipped with Mac OS X 10.4. Use the 10.4 package that shipped with it.
How?
Install it normally, considering the point above.
Snow Leopard won't let me install an older version of OS.
It's not Snow Leopard that won't let you. It's the computer itself.
(52089)

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                                  [click on image to enlarge]
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    Niel wrote:
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    (69744)
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                                  [click on image to enlarge]
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    Creating an iCloud account- Frequently Asked Questions
    Apple IDs and iCloud
    iCloud: Features that work with one account at a time on iOS 5 and OS X
    iCloud: Backup and restore overview

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    Hi:
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