BIOS, in full Basic Input/output System, Computer program that is typically stored in EPROM and used by the CPU to perform start-up procedures when the computer is turned on. 
In computing, BIOS is firmware used to perform hardware initialization during the booting process, and to provide runtime services for operating systems and programs. The BIOS firmware comes pre-installed on a personal computer's system board, and it is the first software to run when powered on.

Nero StartSmart provides a centralized location where users can access all of the Nero applications, including tools for burning CDs, DVDs, and Blu-ray discs, as well as multimedia editing and playback tools. The interface is designed to be user-friendly and easy to navigate, with large icons and clear descriptions of each application.

Bluetooth uses radio waves for broadcasting and communication between devices. Specifically, Bluetooth uses short-range radio waves in the 2.4 GHz frequency band to establish a wireless connection between devices.

When a Bluetooth-enabled device is in discoverable mode, it broadcasts a radio signal, known as a Bluetooth signal or beacon, that can be detected by other Bluetooth devices within range. This signal contains information such as the device's name, unique identifier, and other details that allow other devices to identify and connect to it.

Passcodes are commonly used as a form of authentication when pairing Bluetooth devices. When two Bluetooth devices attempt to connect with each other for the first time, they must go through a process called "pairing," which establishes a secure connection between them.

During the pairing process, the two devices exchange information to verify their identities and ensure that they are authorized to communicate with each other. One way to do this is by using a passcode or PIN (personal identification number).