PPR is Passport Request from CIC. they will only issue that when they have approved your PR application.
basically, when applying PR, you can choose to apply from inside OR outside of Canada. Assuming you are applying from inside of Canada, you will be notified at a certain stage if your application is approved, hence you give get a PPR (Passport Request). you will need to mail CIC your Passport for them to issue the PR (appending something to the Passport if I am not mistaken), then they will mail it back to your address.
this will be different if you chose to apply from outside of Canada, in which you will be mailing your Passport to the nearest local Canada Immigration office around your location in the world (again, I am assuming this would be the case).
So I'd like to gain visibility on how it would be when I first applied for PR inside Canada, then leave the country half-way, then my application got approved, how would I deal with the PPR?
Thanks guys for your replies.