Acoustic energy is used to control motion in a fluid. The new wafer holder design incorporates a series of short radial grooves. The isolator controls unwanted injector ticking noise, while protecting the integrity of the injector’s tip seal. The tool monitors the documents and in response to finding that the criteria has been met, determines meeting participants, generally collaborators working on the documents, determines the meeting participants’ individual schedules, and determines a meeting time based on the meeting participants’ individual schedules.