Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An active object framework is a callback-based form of multitasking for computer systems. Specifically, it is a form of cooperative multitasking and is an important feature of the Symbian operating system. Within the framework, active objects may make requests of asynchronous services (e.g. sending an SMS message). When an asynchronous request is made, control is returned to the calling object immediately (i.e. without waiting for the call to complete). The caller may choose to do other things before it returns control back to the operating system, which typically schedules other tasks or puts the machine to sleep. When it makes the request, the calling object includes a reference to itself.

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