The Booster Halter is a module of the Boosting locomotion; it provides a particular functionality for its parent Booster. If it is disabled or removed, then the relevant boosting functionality will behave as by default. Most modules can optionally affect change globally (for both hands' Boosters). Booster modules can also depend upon conditions specified by their dependencies settings.
During input, the Halter module will stop boosting from occurring. This affects not only regular boosting, but Automator boosting as well. For this reason, it is especially useful in conjunction with the Automator to setup inverted boosting controls.