Which HD actually Booted The System?

How can I tell or verify - which of my two Bootable Hard Drives - was actually used to boot the Mac System.
I have one internal 150GB hard drive, and one external 1TB Firewire hard drive. I used CCC to clone the internal hard drive to the external firewire drive.
Then selected the external hard drive - as the boot drive - then restarted the Mac. Since the external drive is a "Clone" - everything looks the same on the Desktop. OK - I added a new Folder to the Desktop - and titled it "NEW FOLDER Firewire".
Next I selected the internal hard drive - as the boot drive - then restarted the Mac again. Looking at the Desktop - that same "NEW FOLDER Firewire" shows up.
I am thinking that if I boot from the external hard drive - and put a new Folder on the Desktop there - - that new Folder should not show up if I then boot from the internal hard drive. Yes/No?
How can I be certain that the Mac actually booted from the external hard drive - when I selected it as the boot drive? {when everything looks the same on both drives?}.
I must have great misunderstanding here somewhere!
thanks
Carl

OK - I booted from the internal hard drive this time - it shows 4KB
The external HD shows Zero KB.
Now I will reset the boot drive - to be the external drive. Then follow the same procedure - and that time the external HD should show 4KB. {will let you know}.
Just for my understanding:
If I booth from the external hard drive - select that external hard drive - if I then select the "Desktop" icon - files there are still coming from. or being shown from the internal drive - That is to say the system switches back to the internal drive when the "Desktop" icon is selected - Yes/No
To get to the "Desktop" files on the external hard drive - I have to select it - then I have to drill down though the displayed file system on that volume. ie... Users/Beck/Desktop - -Yes/No?
thanks,
Carl

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