A rotating passage feed system for admitting pressure means into two machine parts, shaft ) which rotate relative to one another about a common axis. This new waterjet propulsor has a simple gas supply system without moving parts that supplies either gas or water to the water accelerating rotor dependent upon level of the waterline relative to the gas supply’s inlet. As such, the display device may render images associated with being an attendee of the online collaborative computing session from the received data, and then visually display the images associated with the online collaborative computing session.