Internal vs External hard drive question???

I have a very basic question about OSX and its treatment of drives...
If I have an external drive (either firewire or SATA using an Express34 card) and I select it, at boot time, as the boot drive, does OSX really treat this drive as if it were the internal drive or is there some underlying difference?
Is there a difference between an external firewire and an external SATA drive (other than the I/O speed)?
What I'm getting at is this. I want the ability, using the 'opt+cmd' (or whatever the key seq is) option, at boot time, to select either the internal drive or an external drive to be "THE" drive, as far as OSX is concerned.
Asuming that both drives have at least a bootable OSX partition, I'd like for the external drive to have OSX AND maybe another partition for maybe Windows or Linux.
At boot time if I select the external drive as the boot drive will it act like the internal drive and allow me to install a BootCamp partition? Can I manuly repartition it (while its a secondary drive usng iPartition perhaps)? Can I install a boot loader that will allow me to select an OS after initially selecting the external drive with the 'opt+cmd' option?
I'm looking for the ability to basicaly select different drives as the "internal" drive, much like you would using the jumper and/or cable selects in a Mac Pro or even a PC based system.
Is this even possible? id it is, is it possible with firewire or express34 card driven SATA drives?
Sorry if this is confusing, I'm having a hard time articulating exactly what i want to do...
Thanks in dvance,
Peter

Yes. One cool thing to do is create a bootable backup on an external drive, and use it for OS/upgrade testing - think Leopard. To me this is one huge advantage over Windows systems. You can back up the hard drive and prove it works. Also allows for faster recovery of not only data, but installed applications and settings. I always create a fresh backup to my external FW drive before going on trips.
MacBook Pro 17" 2.16GHz / 2GB / 120GB   Mac OS X (10.4.7)  

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