Instructions
Start AutoExecutor. Mark the applications to be launched on boot using Enter key or Mark soft key on the screen. Go to Options dialog via More/Options and check the box "Load AutoExec on system boot". On the next reboot selected applications will be autostarted. You might use More/Test command to start the aplications you have marked without rebooting the phone.
Signing
AutoExecutor should be Symbian signed prior to be installed on the phone. You may sign it online via Symbian Signed Open Signed Online service.