Is it safe to install 10.4 on an external drive after I have upgraded my MacPro to 10.6.8

I just checked and I have OS10.4.11 and CS3 already installed on an external drive. Is it safe to use  that drive to restart my computer to use these items and then be able to retart using my MacPro hard drive to switch back to OS10.6.8?

Asked already - why continue with a new thread instead of updating this?
https://discussions.apple.com/message/23912189#23912189
Yes. Why wouldn't you. And what  do you expect to harm the system?
ONLY if you upgraded to a later unsupported GPU like the 8800GT or ATI 5770 would you have trouble.

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