Some time ago, someone used the expression "Botstarp" and I thought it had to do with DOS.. The same person explained to me that a bootstrap was a windows app designed exclusevely to run other apps... The matter fell into oblivion until now.... In my current project, during instalation I will need to run a modified extension Associassion App, in order to the files targeted by may app can called the app and run it with a filename arg... y question is... How do I prevent a new nance of the installer, until the current isnstance ha finished..? Its easy to shell a setup.exe file, but not so easy to shel 2 or more in sequence...and that's what I need.. Any Ideas?