All applications required for your device to work efficiently and correctly are preinstalled on your TeachTouch. This set of apps has been tested and optimized to ensure stable and reliable operation under the TeachTouch OS. Yet you can install under TeachTouch OS an Android app of your own choice, which provides additional capabilities you require. You should be aware that TeachTouch OS does not provide access to an 'application market' which users know as a place where they can get a new application. You only have an opportunity of manually installing a new app with the use of an APK file (an archived app distributive file). Polymedia does not provide such files. You have to get this file yourself either by way of downloading it from a software site or directly from a software vendor. Polymedia does not provide support for user installed applications, which are not included in the preinstalled set. If the installed application interferes with the work of TeachTouch, Polymedia support advises to reset the device to factory default settings. Besides TeachTouch users have an exciting opportunity of installing any application of their own choice under Windows OS. To that end, you should install a special PC module into a dedicated slot on your TeachTouch device. Depending on the shipped configuration this PC module may come bundled with such module or not. In the latter case, you have to acquire it as additional option. Regardless of how you get the PC module it will come with the MS Windows OS preinstalled on it. Polymedia does not provide support for MS Windows OS or Windows based software. For those questions please seek assistance from the appropriate software developing companies.