Co-author in conference presentation EDIT: I asked the question poorly, so what follows is an edit of the original.
When submitting an abstract for a presentation on research that is based on joint-work, should all authors be listed or only the presenter(s)?
Co-authorship has (almost) nothing to do with conference registration.
Normally, each person who wants to go to the conference has to register for the conference or else, you know, the conference won't let them in. Just like each person who goes to see a movie has to buy a ticket.
And if you're going to present a paper at a conference, then you need to be at the conference, thus you need to &quot;buy your ticket&quot; and register.  If you co-authors want to be at the conference, they have to register too, whether or not their names happen to be on the paper, and if they don't want to go to the conference they don't have to register.
The only way that co-authorship ever connects to conference registration is for certain conferences that require you to pay for at least one registration per N papers (e.g., if N=2 and you're going to present three papers, then one of your co-authors has to buy a registration even if you're the only one going).  I find that obnoxious, but that's the economic model these conferences have chosen.