When I first read your question, I took your comment "system boot" literally. But now I don't think you're really talking about "upon boot." Rather, I think you want the action to occur when you log in.
(Even if you automatically log-in when you start the computer and you're the only user that this system ever has, there is a distinction between the two points in time.)
I don't know if you're using KDE or Gnome or whatever, but all of these systems have some kind of directory that they look through when you first log-in. Like the AutoRun directories in Windows. That's probably the best way to get what you're looking for.
There are other files used at different times ... .bashrc, .Xinitrc ...
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