R@dier, WaitForInputIdle is what most loaders I've seen use.
Unfortunately my need is different. I can't let the application load itself for the regnumber generation is done during loading .... while the WaitForInputIdle API would "fire" when the application has finished the loading and is awaiting user input. What I need is then to somehow intercept the "application completely unpacked" event, patch the application in memory and then let it run normally.

yaa