Opportunity: Most large congregational areas like railwaystations ...airports ...stadia
             offer ..digital boards (electronic dotmatrix boards or Televsion units
             ... public announcement mediums)

             By having or using the barcoded ...data on such tickets/tokens.


             By making a scanner or senors of barcode ...as accessible terminals
             ...by flashing the ticket ...either such data of a individual or entity
             can be highlighted on a large board or displayed based on a query over 
             a multipurpose display unit (VDU) ...say television units ...given that
             most modern Television sets have processing power(can function independently)
             or work as dumb terminals to a unix based system ...containing the database
             of data that can be accessed.

             [

              while a mobile devices ...given low frequency ...viz. input devices which
              most users possess could potentially function as a input to query services
              while ...the VDU(Television) function as display units for such query services

              ...the usually termed remote-control set ..the frequency can be utilized for
              the same ...given on the assumption that there are atleast one such display
              unit at each entry/exit or boarding point ....for instance railway...compartment
              boarding.

              ]

            Also given the context that DC is power is available on the most trains ...
            ...VDC(dotmatrix board ...a and query interface terminals) ...attached to
            trains would also offer good viable service
 

             

Note: The above problem statement having been encountered in various scenarios
      and detailed in various 'Proof of concepts' as mentioned in 
      
       http://uk.geocities.com/ravivenkatus/projects.pdf
       http://ravishankarkv.tripod.com/projects.pdf
        ....apply appropriate
      'use-case' modeling, rationalize and arrive at a workable and feasible 
       solution both commercially and techinically viable.