ZBot
What is a ZBot? 
Zephyr Bots or ZBots are software agents that reside on target automation systems and form the link between the Zephyr Server and the automation tool being used on the target automation system. Based on user action in Test Execution (where the "E" button is clicked and an automation script(s) is kicked off), the Zephyr Server connects with the target ZBot and sends over execution information to execute an individual test script or multiple test scripts.