Operating systems (Computers) Linux 14 Microsoft Windows (Computer file) 12 Mac OS 5 Microsoft Windows server 5 Computer Science 4 Engineering & Applied Sciences 4 Macintosh (Computer) 4 Programming 4 Ubuntu (Electronic resource) 4 Certification 3 Electronic data processing personnel 3 Examinations 3 Scripting languages (Computer science) 2 Client/server computing 1 Command languages (Computer science) 1 Computer networks 1 Computer security 1 Computer software 1 Development 1 Directory services (Computer network technology) 1 Free computer software 1 FreeBSD 1 Java (Computer program language) 1 Microcomputers 1 Open source software 1 OpenSolaris (Electronic resource) 1 Security measures 1 Software 1 Software configuration management 1