To help on the development process of the mobile App for Environ,we created a custom Mobile Application Service to handle high level commands coming from the mobile device. The mobile service is also able to do some logic depending on the command.A good example of the benefits of using this extension point is the handling of active selection on Environ. We display on the mobile device interface a list of selected objects. With many users using the system at once (many mobile devices at the same time for instance) it can be a problem to maintain the current selected objects list updated on all devices. So, we implemented as part of the Extension Point, a layer of business logic that is in charge of keeping the selection consistent across all connections. When there is a request from a Mobile Device to get the selected elements, the custom mobile service will not pass the command direct to the application, instead it process the command internally and responds accordingly.