Restoring iCal calendars after disk crash

OK, I haven't found this on any discussions I've read so far.
My disk died on my MacBook Pro on Wednesday. It's in the shop. Fortunately I had backed it up on the Saturday before. Now I am temporarily using my iMac. Both are (were) on Leopard.
My question is - what did Apple do to the calendar files!? Through Tiger, calendar files were .ics files, and they corresponded directly to my different calendars by name. When I went to Library/Calendars, some of those were there, but they were ones from long ago. However, there were all these .calendar folders there with an Event folder and a file called info.plist in each of them.
In the Events folders for all these are files named, for example, 00C6C072-2C48-4B99-B3A2-B3241655578A.ics, and these .ics files are the only ones iCal seems to want to import. But when I import them, they are single events, as far as I can tell and the name of the "calendar" in my Calendars list in iCal is, for example, 00C6C072-2C48-4B99-B3A2-B3241655578A. This, of course, isn't at all helpful in trying to restore old calendars - or new ones - by importing them. So, it seems to me that Import is useless in this situation or any other.
Has anyone got any info that can help me understand what they've done here and why (well, no one probably wants to know why), and how I get my calendars back?
Hopefully the tech fixing my MacBook Pro will be able to recover some data from the disk drive, and the old calendars will be among the data recovered, but even then, with this new system of saving calendars and events, how does one import calendars into the newly installed iCal?
I'm not looking forward to having to rebuild my calendars, but it's looking as if I may have to. So far, this design of iCal is not a better idea.
Thanks in advance for any help anyone can give me.

Well I finally solved the problem. The confusion is in the wording.
Both iCal and Address Book have functions that work well to move calendars and contacts from one machine to the other.
Menu\File\Back up Database.
Menu\File\Revert to Database Backup.
Well I was scared of the Revert to Database Backup. It works. When you do so, you just point the program to the backup that you just made from the other machine, if it's what you are trying to accomplish.
I hope this might help you.
Maybe everybody knows how to do this and I am a slow brain - Leon.

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Unfortunately this Metalink note is not solution to my problem.
My problem is database name written in the file header which is - "\E":
ORA-01161: database name \E in file header does not match given name of XE
It is obvious that database name stated in control file is not "\E" and because of that create control file script fails.
I don't know is data file corrupted and because of that I have in file header "\E", or this is some problem due to the character set, or XE Oracle software version, or something like that.
Anyway thanks for your help!
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Thank you Eric for your fast answer.
this worked and now I have a running SL system. I guess I try to install maverics first and then use the emigration assistent to recover my data.
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