This updated document provides information on how to develop Bluetooth applications in C++. In Symbian OS, the Bluetooth API consists of various components, and there are also some additional S60 APIs. The document describes how to perform typical Bluetooth tasks such as discoverability and service advertising, device and service discovery, and communication using different protocols. Security and platform security, configurations, and changes in the Bluetooth API v2 architecture (introduced in S60 2nd Edition, Feature Pack 2) are also described. The document provides several code snippets from separately published code examples.