# Tencent RTC Live — Web

> Live documentation for Web platform.

## Core SDK

### API Reference

- [API Reference](https://pre.trtc.io/document/67252.md): AtomicXCore SDK is a reactive API from TRTC designed for web platforms, enabling live streaming, instant messaging, audio/video calls, and voice chat rooms. It offers comprehensive capabilities including user authentication, device management, screen sharing, and member control. This reference details the API interfaces for managing login states, device states, and other core functionalities to help developers build responsive and feature-rich communication applications.

### Error Codes

- [Error Codes](https://pre.trtc.io/document/60027.md): Tencent RTC Error Codes document lists detailed error codes for API callbacks and RESTful APIs, helping developers troubleshoot issues related to user rendering, room management, audio/video permissions, device access, and network restrictions. This guide is designed for developers integrating Tencent RTC SDKs to efficiently identify error causes and apply appropriate solutions.

### Generating UserSig

- [Generating UserSig](https://pre.trtc.io/document/35166.md): This guide explains how to calculate UserSig, a security signature for Tencent-RTC services, during the debugging phase. It covers obtaining SDKAppID and SDKSecretKey from the Tencent-RTC console and generating UserSig using client sample code on multiple platforms including Android, iOS, Web, Windows, Flutter, and Mac. The steps ensure secure authentication for developers testing Tencent-RTC SDKs before official deployment.