Back to the DOS days.AutoExec works the sameway as Autoexec.bat on a DOS/Windows PC.The big difference is that you don't have to edit anything in Notepad.AutoExec allows you easily create and change the list of applications that will be launched when your phone is turned on.
You can find more info and try/buy AutoExec here: http://www.symbianware.com/product.php?id=autoexec60