Unpairing and pairing keyboards between two iMacs

Hi,
There's plenty of discussion on these matters over here, but I decided to start a new thread specific to my situation and to see if I've understood what I've read so far. 
- I just got a new iMac ( 2.7GHZ i5   --- OS 10.6.6 ) which came with the chrome colored wireless keyboard without the numeric keypad. 
- I want to use the USB keyboard and a third party USB mouse that I've been using on my older iMac (2.4GHz Intel Core 2 Duo --- OS 10.5.8 ---(Came out probably 2007 or 2008)) because I need the numeric keypad for shortcuts in certain programs. Plus, I don't wanna be dependent on battery life.
Here's what I understand I should do: I'll also insert questions here:
1. unpair the wireless keyboard (and the magic mouse) in system prefs with my new iMac
Q-if something goes wrong and I just can't get it to pair with my older iMac, is it easy to pair it again with the newer one which it was originally paired with?
2. Remove all USB "inputs" from my older iMac while it's shut down. Power up the older mac with the wireless keyb/mouse in near vicinity.  
Q- Should I have them turned on while the computer is starting up?
3. If it doesn't work, clear PRAM and try again (?)
Have I missed anything important?  The magic mouse and the new wireless keyboard should work on the older iMac, right?
Thanks in advance!

Hi:
Glad they are paired! 
The touch functions (scrolling etc) of the mouse arent working though... probably won't work on OS 10.5 ?
The functions will work (except for momentum scrolloing) after you install this update:
http://support.apple.com/kb/HT3925
Oh, another quirk I noticed is that some keys aren't properly mapped... like the "increase volume" key brings up the dashboard... how can I change this?
That is normal behavior under OS X 10.5.  Since I have not used 10.5 for quite awhile, I do not remember if there is a way to change it.
Barry

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