I haven't used Gnome in a while but if i do remember correctly there is a session customizer.
Which means you can turn on applications to start up when you log in.
System -> Preferences -> Sessions
Go to the "Startup Programs" tab, click the Add button and either use Browse to add an application from the /usr/bin directory
or use the Command field and write the programs command in (the one to open it).
You can also add a name and a comment.
After your done, click OK then log out and log back in again.
If you need a bit more ino on how to do it check out this link.
For the second part of terminating and exiting, I can't help you on that one.
Google is your friend.
If I do find anything, I'll post back.
Hope this helps.