it allows for booting from the optical drive rather than the hard disk. 
Esential for installs.
On 2011-07-17, at 10:52 AM, Deedra Waters wrote:

> By the way, what does holding down the C key do on restart?
> Kaare Dehard wrote
> | Hi, I didn't have any difficulty. Of course if you are using time machine, 
> don't forget to back up first...
> | 
> | When I did the leopard to snowy upgrade, I first backed up system with time 
> machine, just in case...
> | Then inserted the dvd and restarted... when I restarted, holding down the 
> (c) key will boot from dvd.
> | 
> | It does take quite a bit more time to boot up with dvd, so patients is the 
> key here. I then pressed command-f5 expressed more patients while voiceover 
> loaded up, then after it came on it is just a matter of working through the 
> prompts.
> | 
> | If this is your first time, feel free to take your time, and all should go 
> well.
> | On 2011-07-17, at 9:44 AM, Deedra Waters wrote:
> | 
> | > Does anyoneknow how easy this would be? I've got an intel mac running
> | > leopard butneed to upgrade the os. How dificult is this?
> | > 
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