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# Groups Of Related Classes

This is a list of functional groups of Qt classes. A class can appear in more than one functional group.

Codecs | Codec support in Qt.
Event Classes | Classes used to create and handle events.
Generic Containers | Qt's template-based container classes.
Help System | Classes used to provide online-help for applications.
Input/Output and Networking | Classes providing file input and output along with directory and network handling.
Network Programming API | Classes for Network Programming
Non-GUI Classes | Collection classes such as list, queue, stack and string, along with other classes that can be used without needing QApplication.
Painting Classes | Classes that provide support for painting.
Plugin Classes | Plugin related classes.
Printer and Printing APIs | Classes for producing printed output
Qt for Embedded Linux Classes | Classes that are specific to Qt for Embedded Linux.
Rendering in 3D | Classes that provide support for rendering in 3D.
Secure Sockets Layer (SSL) Classes | Classes for secure communication over network sockets. The classes below provide support for secure network communication using the Secure Sockets Layer (SSL) protocol, using the OpenSSL Toolkit to perform encryption and protocol handling.