The Echo Hub monitoring software is a sophisticated set of complimentary applications. There is an application that is in charge of the User Interface (think of it like a browser), an application responsible for all of the logic and content (think of it like the web server that serves content to the browser) and a connector service that communicates between the Echo HUB device and the Monitoring Software.
Therefore, if you look at it from your Task Manager you may notice that there seems to be three instances of MTS Echo running on your computer. It is not actually three distinct and separate instances of MTS Echo. Instead, what you are seeing are the three parts of the MTS Echo software that each have a thread for the processor.
The proper way to end the MTS Echo HUB application is to click on the red "X" in the upper right of the Window which should close the User Interface part of the application and that should send a signal to the other parts of the app to also shut down.
If they are still running, you can right click on the HUB icon in your system tray, then click on "Exit" and that should end the application.
As a last resort, you can use Task Manager to "kill" any of the MTS Echo tasks that are still running.