1 Introduction
This document specifies the Remote Desktop Protocol: Virtual Channel Echo Extension to Remote Desktop Protocol: Basic Connectivity and Graphics Remoting, as specified in [MS-RDPBCGR]. The echo messages defined in section 2.2 are used to bounce a payload sent by a terminal server off of a connected terminal-server client, thereby providing a simple mechanism to determine network characteristics such as round-trip time (RTT).
Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.