A beverage dispenser comprises: a housing, at least two refillable containers for storing bulk beverage ingredients, at least a beverage preparation unit operatively linked to the containers for preparing a beverage from at least one of the stored bulk beverage ingredients, a sub-housing in which the containers are placed, the sub-housing being removable from the housing. A pipelined architecture is used and is divided into 4 stages with 8 parallel data path. Some embodiments of such an interrogating system may include interrogating apparatus adapted to be mounted to a vehicle or at a vehicle loading zone, to interrogate passengers andor other persons prior to boarding or accessing the vehicle. The active and passive waveguide portions have substantially similar guiding properties with the exception of a mode tail above a top surface of the passive waveguide portion within the active waveguide portion. Alternatively, the strip of cleaning fabric is soaked on site by contacting the strip of cleaning fabric with the solvent and wrapping the strip of cleaning fabric into a cleaning fabric supply roll. The method includes transmitting a predetermined request from the device to the portable storage, generating a current permission status format including information of a rights object designated by the request, using the portable storage, and transmitting the current permission status format from the portable storage to the device.