Thanks for the replies guys. The reason I ask is that I have heard stories of shady dealers and ATF agents posing as parking lot sellers. Whether this is true really doesn't matter, but I want to mke sure who I'm buying from and the process is legit. I'm located in TX for those interested.
So from what I gather the process is no different than walking into the local gun shop, filling out the form and having them do the check.
This brings me to a second question though. How do they do a background check if they are at the show. Is it something they call in from their cell phone?