This is not possible in a "chicken and egg" situation: My app is a plugin for a main app. The main app can't find me to launch me until I "seed" its directory w

This is not possible in a "chicken and egg" situation: My app is a plugin for a main app. The main app can't find me to launch me until I "seed" its directory with a pointer to me. To make my app visible to the main app, I place a "cookie" in the main app's directory (not my design), which is done by the installer script. Without this, the main app will never find my app. And the user can't launch me until he sees me in the list of available plugins. Vicious circle.