Comment 5 for bug 1074483

-In my opinion, the Welcome screen is shown first, diaplaying a list of supported '¿services?' you know.. Gmail, Hotmail, Yahoo etc. and when one is clicked is shows the dialog.
Read the HIG of the Welcome Screen or ask Daniel Fore.
Welcome Screen: http://elementaryos.org/docs/human-interface-guidelines/ui-toolkit-elements/welcome-screen

-I'm not a developer so I don't know if the documentation is the latest, but I attach a screenshot showing the About Dialog of pantheon-terminal