The ITK Testbench contains two tools; the Toolkit Workbench (TKW) and Autotest Manager.
TKW is a command-line standalone test engine for message validation, message transmission, and ITK end point simulation.
Autotest Manager is a graphical user interface (GUI) driven fully-automated test tool. It orchestrates the execution of multiple tests using TKW as the test engine. The Autotest Manager has recently been updated to include a "single run" mode which effectively offers, via the GUI, the same functions as the TKW command line.