The gray button adjusts the camera's focus, exposure, and white balance settings automatically. The gray button works in both OKIOLABS applications and third-party applications. The other buttons are only functional within OKIOLABS applications. You can customize the functions of the additional buttons to several of the different functions of the OKIOLABS apps.
If you are a Windows or Mac user and you want full button functionality in OKIOLABS applications, you will need to install OKIOCAM Button Driver. You can download OKIOCAM Button Driver from the Support & Download section of the OKIOLABS website.