What does e-file transmit?

After completing my returns, when I go to the Print Center’s Form Selection screen and select “All official forms required for filing,” can I assume what prints out are the only pages -- no more and no less -- that are needed by and transmitted to the IRS and California Franchise Tax Board when I e-file both returns?  I’m a little surprised that federal Form 1099-R is not printed out. 

 

(I like to know specifically what data is provided to those tax entities by TurboTax when I e-file.  I know exactly what the government is getting when I mail in a hard copy return, but I am not so sure what is transmitted when I e-file.)

 

Thanks.