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DOOCS is a distributed control system that was developed for HERA and TTF applications. It is an object oriented system design from the device server level up to the operator console. Class libraries were developed as building blocks for device servers, communication objects and display components. The whole system is written in the programming language C++ and runs on Solaris, SunOS and LINUX operating system and on SPARC and x86 hardware. The communication is established by a standard set of data and address objects which are transferred by Remote Procedure Calls ( ONC RPC) or other protocols.