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Source: Baidu Encyclopedia-Teacher Qualification CertificateHandle (Handle or Descriptor, referred to as Handle under Windows and Descriptor under Linux): Essentially represents a resource (such as file descriptor or socket descriptor for network programming) provided by the operating system; This resource is used to represent events one by one, which can come from both the outside and the inside. External events such as the client's connection request, the data sent by the client, etc.; Internal events such as timing events generated by the operating system. It is essentially a file descriptor, and Handle is the birthplace of events.When I found myself sitting in the cockpit of the mecha, Gu Xixi was overwhelmed.　　Mobile phones have grown rapidly in the past 10 years, with shipments reaching 1.4 billion units in 2010, but demand is still not saturated. At the same time, the miscellaneous nature of mobile phones is also increasing day by day, shifting from 2G of pure voice to 3G, and recently to 4G multifunctional smart phones. In addition, Wi-Fi, Bluetooth, Global Positioning System (GPS), FM radio and other wireless connection functions also increase the complexity of mobile communication.