This app is for use with the game DuckHunt Missouri - running in the same local network (as your iPhone wifi). The app turns your iPhone into a virtual shotgun using the iPhone's camera and a novel patented computer vision algorithm that enables aiming to the computer screen (or TV).
Some other buttons are available - such as the sniper zoom feature.
The free Demo version of the games for Windows and Mac to use with this app - will become available soon on Steam.

For the app to offer the connect button on the starting screen the instance of the game (Duck Hunt Missouri) has to be running (on Windows or Mac computer) in the same local network as the wifi of the cellphone is using. The game is broadcasting its game host info which the app captures and creates the connect button. In case more than one instance of the game is running in the local network - more connect buttons will be offered for connection.
Many players can connect to the same game and play in two teams.