Graphical user interfaces (Computer systems) Application software 2 C++ (Computer program language) 2 Development 2 Java (Computer program language) 2 Programming 2 Python (Computer program language) 2 Authoring programs 1 Client/server computing 1 Computer graphics 1 Computer networks 1 Computer programming 1 Design 1 Management 1 Object-oriented programming (Computer science) 1 Operating systems (Computers) 1 Telecommunication systems 1 Voice mail systems 1 Web sites 1