Universal Properties These include user-visible keys like Name, Icon, and Description, which will be shown in several places, like the list of Runners available under System Settings > Search > Plasma Search.| Developer
An overview of Qt's signals and slots inter-object communication mechanism. Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. Signals and slots are made possible by Qt's meta-object system.| doc.qt.io