Can I have a second, external HD with a higher OS than my main drive?

I've started to come across a few programs that need OS X 10.4 or higher to run. I have a beautifully stable system with 10.2.8, and I hate to mess that up, especially since my internal CD drive has stopped running, and am using an external CD/DVD drive, which I'm told can't work as a startup drive if things go wrong. I'm not quite ready to bite the bullet and get a whole new computer, so I'm wondering if I got an external drive, could that one be set to run the few programs that need 10.4 (or 10.5)? How would that work? If it's going to cost too much money, I'd rather get a new laptop and network the two computers using airport extreme, but I calculated the cost of all the upgrades at about $2k, which I really don't have right now.
And if it's not doable -- what's the consensus on using 10.4 or 10.5 on these 17-inch 1 Ghz iMacs? I see a lot of problems in discussions on installing 10.4, and don't see that many entries on 10.5 -- is that because it's working well, or because these machines will pretty much choke on it?
Thanks.

Thanks. I thought I could do something like that -- you used to be able to back in the pre-OSX days, but I don't pay as much attention as I used to, so I don't know if the new technology allows it.
One question -- in case the main machine crashes -- what's the key command or procedure for forcing the backup hard drive to serve as the the main drive to boot, or does the new system simply look around for any startup disk in case of failure?
Also, any recommendations for an inexpensive hard drive that will fill this role and connect to this iMac? I think it would have to be a Firewire -- both my ports are full, can I daisy-chain them somehow? From looking at all the cords back there, I think it's my external superdrive and my iPod dock. The iPod dock can easily be plugged in and out as needed, but the other two should be up full time, so I'd have to plug the dock somewhere. It will be nice to upgrade iTunes to version 7, if my ancient iPod will work with that. (My computer setup is very 2003).

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I am trying to control my main wireless network with access control via mac id with no password.
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paolo@spring wrote: How can I use a second external webcam with my MacBook Air 11" 2011?...
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mgott55 wrote:
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