Software Hotel Customer Accounting

[Alain Zanon]

        I'm looking for writtings, design specifications  and  C  source
        codes  running  on  UNIX/like  OS's or possibly DOS for handling
	hotel  customer  accounts and  services.  These  should  include
	facilities such  as:
        	
        -  Customer  accounts   management   (restaurant,   bar,   hotel
           shopping, room television and bar charges, laundry, telephone 
           etc...).  
	-  Waiting message signalling (indications).
        -  Booking of air flights, busses,  trains,  cars,  hotel  rooms
  	   etc...  
	-  Billing.
	-  ........
	
        The system will  be  interfaced  to  a  computer  based  private
        telephone  exchange  (PABX).   A  few  video terminals, the PABX
        interface and a printer are used as data I/O devices.  

	I would appreciate very much if you can help me on this matter.
 
					Many Thanks

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