On line Product

I understand you can only e-file one tax return using the online product.

1.   However, if using the online product, are you able to complete, print, and mail in an unlimited number of federal tax returns?

2.   If using the online product, how much additional does it cost to complete and e-file a state tax return?

3.  One you pay for a state return, how many state returns can you do?  If the answer is just one return (including e-file), are you able to complete, print and mail in an unlimited amount of state returns - from the same state?