Operating systems (Computers) Linux 510 Microsoft Windows (Computer file) 265 Computer science 195 Computer Communication Networks 140 Software engineering 129 Programming 119 Certification 110 Information Systems 103 Macintosh (Computer) 102 Electronic data processing personnel 100 UNIX (Computer file) 94 Examinations 90 Computer software 82 Computer networks 64 Data encryption (Computer science) 53 Computer programs 51 Mac OS 49 Client/server computing 48 Embedded computer systems 45 Microsoft Windows server 45 Development 40 Logic design 38 Application software 37 Information storage and retrieval systems 37 Microsoft Windows NT 36 Study guides 35 Computer security 34 Computer system performance 33 Computer network architectures 29