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open source softwareopen source software oss is software that comes with source code and importantly also provides rights typically reserved for
keystroke logger and data-stealingkeystroke loggers this is a program once installed on the system which intercepts the keys when entering the
trap doors this is a way of bypassing normal authentication procedure windows operating system user name and password to access a system
perverse softwareperverse software is a program which causes hindrances in other programs execution in such a way resulting in modification or
backup softwarea number of backup software are available that assist you in taking backup of your important data on the computer selecting between
application software application software is designed and developed to accomplish one or more specific task or solve a particular problem
device drivers device drivers are shared computer programs that provide an interface between the hardware devices and operating system or
server programs server programs are dedicated computer programs that run as services and serve the needs or requests of other programs these
operating systemoperating system is the software that manages all the computers resources to optimize its performance provides common services
system softwaresystem software helps run the computer hardware and system it is designed to control the operations of a computer and
technology partnershipssuch agreements provide the consumer un-limited access to vendors technology such contracts are typically multi-year in
rental model this has come into picture as software as a service saas and platform as a service paas models have evolved over a period of
transaction-based modelhere the pricing is based on providing a committed business service for ex processing payroll for a global
software licensinguntil early 1970s sharing of software was the accepted norm hardware came bundled with software products which could be freely
client server architecture as the capacity and power of personal computers improved the need to share the processing demands between the host
development of personnel computer operating systemthe next important breakthrough in computer use occurred in 1982 with the introduction of the
development of unixthe original unix development was performed on a digital pdp-7 minicomputer and later moved to a pdp-11 minicomputer the
time sharing systemwith the use multiprogramming the batch processing can be quite efficient however for many jobs it is desirable to provide
simple batch systemsearly machines were very expensive and therefore it was important to maximize machine utilization to improve utilization the
memory managementthe purpose of the memory management system is to load programs into memory in such a way as to give each program loaded the
process control management a process is an executing program it is considered the standard unit of work within a computer system every
inputoutput services every operating system large or small provides inputoutput services for each device in the system the operating system
file management the concept of a file is central to the effective use of a computer system a file is generally loosely defined as a collection
command processor and user interfaceto the user the most important and visible services provided by the os is the user interface and the
operating system servicesin this section we consider basic services supported by an operating system there are many building blocks to be