If I want to mine on multiple computers, is it as simple as registering another worker on the pool and then getting the software running on the 2nd computer? If that is the case, any payout goes to the wallet via the address in the wallet and pool? Obviously I am a little confused on how multiple mining machines works and I havent found much good information out there to point me down the right path.
Thanks!
With most pools, you can either register a new worker if you want to keep track of how each machine is performing, or just point both machines to the same worker; in this case, the work from both machines will be added together. You'll need to run the mining software (cgminer is recommended here) on each machine whichever way you do it.
What happening under the hood is that pool will distribute "work units" to each machine that connects to it. The results of the work unit is then added to the worker that the machine is configured with.
For payouts, you normally register your wallet address with the pool for either automatic payouts (say every time you earn at least one Bitcoin) or you can request a manual payout.
Be aware that your Nvidia GPUs will earn only a small fraction of a BTC per year.