7. Comparison of Operating Systems Feature Mainframe Network Personal Computer Handheld Device Number of Simultaneous Users Multiple Multiple One One Security Sophisticated Sophisticated Minimal/user-enabled Minimal/user-enabled Peripherals Complex Numerous Few Few Number of tasks Many Many Many Few Support Systems programmers Networked-certified personnel User Provider Example OS390 Novell NOS Windows XP Windows Mobile
31. Commonly Used Languages Language Common Use C (including C++ and C#) Writing a wide variety of applications for PCs or network servers. Java Writing software for all types of computers; also, for writing browser and server-side Web software. PHP Writing Web-based applications. SQL(Structured Query Language) Writing queries to relational database management systems. VB.NET (Visual Basic .NET) Writing software for PCs; also, for writing browser and server-side Web software (Microsoft’s competition of Java).
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