Qt Creator supports the entire Qt app lifecycle, from creating projects to defining source files and other resources to deploying the app on a target QNX CAR system. After it's installed on your target, you can run the app by tapping its icon in the Apps Section screen.
The sections that follow provide a walkthrough of writing a Qt app, packaging it, deploying it on a QNX CAR system, and then running it. Here, app refers to a Qt program packaged as a BAR file, which makes it visible in the Apps Section screen of the HMI. The steps for writing a more elaborate application (e.g., a new HMI) are the same except for the packaging (because the application would not be packaged as a BAR file).