Operating systems (Computers) Unix (Computer programs) 12 Linux (Computer programs) 8 Computer networks 6 Windows NT (Computer programs) 6 Client/server computing 4 Computer software 4 Embedded computer systems 4 Information technology 4 Microsoft Windows (Computer file) 4 Netware (Computer programs) 4 Windows 95 (Computer programs) 4 Application software 3 Computer programming 3 Computer science 3 Computers 3 C (Computer program language) 2 C++ (Computer program language) 2 Computer algorithms 2 Computer input-output equipment 2 Computer security 2 Data structures (Computer science) 2 Database management 2 Internet 2 Linux 2 Microsoft Windows 2000 (Computer programs) 2 Norton (Computer programs) 2 Programming 2 Software 2 Software engineering 2