I assume "Displaying a message box at every login" mean running an application that display a message box every time u login.
Now, there are two ways of doing it.
1. Either you can add one entry in your profile file. e.g if you are using bash as your shell, you can add one entry in ~/.bash_profile
<yourr-applicationpath> &
2. Or you can make use the starting application capability of the Display Manager.
a) For Gnome, add the application in Session preference.
b) For KDE, copy your execuatable at ~/.kde/Autostart directory.
I hope it helps!
~Bhopal
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