TeamViewer is a software product for remote control of desktop devices.
It is often utilized for distant management of work stations and servers, technical assistance and explanation how to use a program; it provides safe data transferring, connection to a work station from a mobile device, etc.
Test engineers use TeamViewer for showing presentations, explaining peculiarities of software functioning, demonstration of defects.
The tool is available in many languages, supported by popular desktop and mobile platforms, it can be used for free.