1. Two Broad Categories of Software
Applications Software
Examples:
productivity software
desktop publishing software
educational software
games
Systems Software
operating systems
utility programs
language translators

2. Productivity Software Packages
Software Suites provide a set of full featured application packages
reduced price
common interface
application packages can share data
Integrated Software Packages
only main features available
cheaper than suites
less storage required

3. Who owns software? Proprietary Software Shareware and Freeware
single user license
site licenses
Shareware and Freeware

4. System Software
Computer programs that enable application programs to run on a given set of hardware
Examples:
operating systems
utility programs
language translators

5. Operating System
A collection of computer programs the manage a computer’s activities
single user operating systems
network operating systems

6. Operating System Functions
starting the computer
providing an interface
command line
graphical user interface (GUI)
running other software
assignment of system resources

7. Operating System Functions (cont.)
scheduling CPU (central processing unit) tasks
multiprogramming
multitasking
multiprocessing
coprocessing
symmetric multiprocessing
parallel processing

8. Operating System Functions (cont.)
monitoring activities
housekeeping
file management
bookkeeping
security

9. Utility Programs general purpose software tools
often part of the set of operating system programs
examples:
disk utilities
device drivers

10. Language Translators converts computer programs into machine language
compilers
interpreters

11. Language Translators High Level Languages (C, C++, Visual Basic, etc.)
compilers, interpreters
Assembly Language
assemblers
Machine Language
Hardware

12. Operating Systems MS-DOS Windows 3.x (3.0, 3.1, 3.11) Windows 95, 98
Windows CE
Windows NT
Server, Workstation
Windows 2000
Professional
Standard, Advanced Server, Datacenter Server
UNIX, Linux
Novell Netware