Re: Gridcoin (GRC) - first coin utilizing BOINC - Official Thread
On each machine? Darn. I figured that as long as one machine was running the wallet and sending the beacons that the other machines could just be contributing work units that would show up on the BOINC site 
The other machines do contribute the work and it will show up on the BOINC site, however I don't think you'll get GRC for the work they do on your main PC....I think that the work is limited per host, so you can't use other machines to rack up credits for the first one.
However I'm not 100% sure and you should probably ask Rob to confirm.
Andrew.