Operating Systems

Depending on who developed the cell phone, many different operating system could be run on it. For example, the iPhone runs an iPhone OS that Apple designed themselves, and all Nokia phones run Symbian.

Windows

Mac OS X

MS-DOS

VxWorks

QNX

MS-DOS

DR-DOS

AmigaOS

In a proprietary operating system, there are fewer people available to audit the code for any bugs and security flaws. A proprietary system also limits the end-user in the types of modifications they can make to the system.

Kubuntu is a Linux distribution produced by Canonical. It has the same underlying software as Ubuntu, but a different desktop environment. Kubuntu uses KDE, an environment more superficially resembling Windows. Contrast this to GNOME, which has a Mac OS 9-ish look to it.

Ready time, starting deadline, completion deadline, processing time, resource requirements, priority, subtask structure.

Microsoft Excel is an Office Productivity Tool. This tool can be used for doing Calculations.

follow the link to Microsoft for online tutorials

A dual-core system is a system that has a single processor die with two physical cores. Each core acts similarly to it's own processor, so the computational load can be divided, and performance of individual programs will be better.

It depends on where abouts you live e.g it varies from state to state. usually 6 months though 180 days. Hope this helps

Simply put, the operating system is a set of software code assembled to have the hardware of a computer performing a series of basic tasks that, working in conjunction, will provide the many functions of the computing process, like reading a record from a disk, checking a field, opening a file, sending an instruction to a printer, etc.. It is normally written in a specific programming language, which relates to the low-level code required by the machine to be understood.

An application software is a piece of code that runs on top of the operating system, collecting inputs from an operator/user, submitting these data to its internal rules for processing and delivering the corresponding results to an I/O (input/output) device - a monitor, a printer, a CD-recorder, etc.. It is normally written in a high-level language, familiar to programmers and offering several aids to make the programming easier.

Several application softwares can be contained in a single computer and are activated every time a specific process is to be performed.

Application software needs an operating system to have the machine running, because it sends its commands (open, write, read, close) to it expecting that they will be performed in that order, and that the operating system will return the information after being processed.

In fact, the application software uses the operating system as an interface between itself and the hardware, to have specific jobs performed and results delivered.

Time sharing OS allows user to share the system simultaneously. Each user is allocated resources for a particular time slot. Parallel processing - various process can execute simultaneously, there is no resource allocation scheme.

concurrency is the interleaving of processes in time to give the appearance of simultaneous execution. Thus it differs from parallelism, which offers genuine simultaneous execution. However the issues and difficulties raised by the two overlap to a large extent:

• sharing global resources safely is difficult;

• optimal allocation of resources is difficult;

• locating programming errors can be difficult, because the contexts in which errors occur cannot always be reproduced easily.

Parallelism also introduces the issue that different processors may run at different speeds, but again this problem is mirrored in concurrency because different processes progress at different rates.

Dorothy Mary Hodgkin, OM, FRS (12 May 1910 - 29 July 1994) was a British founder of protein crystallography; prior to her marriage, she was known as Dorothy Mary Crowfoot. She pioneered the technique of X-ray crystallography, a method used to determine the three dimensional structures of biomolecules. Among her most influential discoveries are the determination of the structure of penicillin and vitamin B12, for which she was awarded the Nobel Prize in Chemistry. In 1969, after 35 years of work and five years after winning the Nobel Prize in Chemistry, Hodgkin was able to decipher the structure of insulin. She is regarded as one of the foremost scientists in the field of X-Ray crystallography studies of natural molecules. Besides her extraordinary scientific abilities, she was unassuming, very communicative, and passionate about social inequalities and peace. She did not invent anything; she got a Nobel Prize for figuring out the structure of lots of important stuff to our staying alive. As in vitamin B-12 and other stuff about the body.

External fragmentation refers to the division of free storage into small pieces over a period of time, due to an inefficient memory allocation algorithm, resulting in the lack of sufficient storage for another program because these small pieces are not contiguous.

Stability is difficult to measure in absolutes. A good measurement as to the stability and reliability of an operating system is the record of the highest "uptimes." Uptimes are the length of time a system has been running without the need for a reboot. Note that other factors, such as natural disasters or power outages may have a bearing on uptime not related to stability.

The absolute highest uptime recorded is 18 years, by an OpenVMS server. A nicely updated competition of uptimes can be found in the "Related links" below. A rough summary of uptimes, from highest to lowest, is:

1. Linux

2. FreeBSD

3. Windows

4. Mac OS X

5. Sun / Solaris

Network computers send their information back to a server. It connects more than one computer so that the files may be shared as opposed to the traditional computer which has one CPU and doesn't have any direct link with a network.

Open GNU is a free software system that allows users to adapt the software to specific parameters. Applications like Openoffice are part of the Open GNU system.

1.It very fast as compare too human, as it takes very few time to process the instruction given by user

2.Its storage capacity is very vast as compare to human , trillions and trillions of datas can be stored in computer

3.It is very accurate , means it does not make any errors until and unless given instructions has got errors

Given by Azmat

kernel

A timesharing operating system is one that divides up CPU time into equal slices that can be shared among applications. In the case of a multi-user system, these time slices are shared among users.

NetWare

stolen