The executable is identical between trial version and real version. The trial version is using the trial serial number. Applications built with trial version will ask you to register after you click on the button three times or when you exit the application.
After you use the register program ( in "JCSoft MagicApp" program folder ) and type in the real serial number, all the applications created after that will be commercial products. For Visual Basic applications built with trial version of MagicApp you will need to recreate the executable to get the commercial product. For Visual C++ it's more complicated. You have to recreate the application.