I've been reading and trying to understand this but i'm just not finding the answers.

I have many computers in my home and want to set them all to mining. When installing bitcoin on each one they each get their own address. How do I have the work done by all these machines consolidated under one account?
I have various windows machines and an imac.

I'd like to run my own pool but i'm getting the impression that it may just not be worth it and joining a pool would be best? I'd still like to put all my computers to work on this.  My imac is a 2011 with the AMD 6970m,  my main PC has a 460GTX.  I have two other machines with a Radeon 3350 and 5570.  And another with a Nvidia 8800GT.  The a few other computers with onboard video(Intel G45).
If it's financially viable I can swap out the 460GTX for 3 AMD cards as that motherboard supports it.