Everybody take a deep breath.
There's a difference between filling out a form on a computer using software and filling out an "online" form.
An "online form" would be a form that resides on a remote website and is filled out via the internet.
Filling out a form on a computer using software does not mean that the form is online, it only means that the form is being filled out on a computer.
When I type something into a document on my computer, I am not creating an online document. When I go to a remote website and edit or upload information to a form on that website, then I am creating/editing an online form.
The fact that some dealers are using software that allows the buyer to fill out a 4473 form on a computer is NOT evidence of the existence of an "online 4473".
An "online 4473" would be filled out via the internet. A software version of a 4473 form filled out on a computer does not even need the computer to be connected to the internet.