Most applications will need to communicate with other services or devices at some point, or at least save settings on the host computer. These concepts are covered in this module.
After introducing the generic concept behind devices, short examples show how to use files.
Afterwards, the module covers networking and its representation in Qt. In addition to providing classes for handling low level sockets, network managers simplify handling web service requests and responses like for the HTTP protocol. At the end, a short section explains the basics of different methods of parsing XML in Qt, including DOM trees, SAX, pull parsing and XQuery/XPath.
A section about internationalization demonstrates the process step-by-step, showing all required components to make your application multi-lingual.