I have an app that assumes the role of say a master interface. From that interface you can launch programs included in the particular suite of software. My problem is that those progrms launched by the master interface need to communicate with the Master interface to find out if the user is logged in and if not force the user to login to the system. How do I communicate between these two apps. Can someone point me to the right direction. They are both locally run apps(some Computer), one of them is just in charge of the others really. I have zero experience communicating between apps as you can tell.