Your computer behaves weirdly. in a way that you haven’t seen before.
You hear sudden sounds, played at accidental
Programs start unpredictably
Your personal firewall tells you that an application has tried to connect to the Internet.
Your computer ‘freezes’ frequently, or programs start running slowly.
You get lots of system error messages.
The operating system will not load when you start your computer.
You notice that files or folders have been deleted or changed.
You notice hard disk access when you’re not aware of any programs running.
Why is it essential to secure my wireless network?
These days, most computers are wireless-enabled: they let you connect to the Internet without a physical network cable. The major benefit, of course, is that you can use your computer anywhere in the house or office there are potential risks involved in wireless networking - unless you make your network secure:
A hacker could interrupt any data you send and receive;
A hacker could get access to your wireless network;
Another person could hijack your Internet access.
Therefore, if your wireless network is not protected, a hacker could intercept any data you send; access your network, and therefore your shared files; use your bond to connect to the Internet - especially significant if you have a download limit on your internet package and your bandwidth is being swallow up by a captor
Tuesday, February 16, 2010
symptoms
What are the symptoms of an contaminated computer?
It’s not always easy to tell if your computer has been compromised. More than ever before, the authors of viruses, worms, Trojans and spy ware are going to big lengths to secrete their code and conceal what their programs are doing on an infected computer. That’s why it’s essential to follow the advice given in this conduct in particular, install Internet security software, make sure you apply protection patches to your operating system and applications and backup your facts intermittently
It’s not always easy to tell if your computer has been compromised. More than ever before, the authors of viruses, worms, Trojans and spy ware are going to big lengths to secrete their code and conceal what their programs are doing on an infected computer. That’s why it’s essential to follow the advice given in this conduct in particular, install Internet security software, make sure you apply protection patches to your operating system and applications and backup your facts intermittently
Tuesday, February 2, 2010
Business software is generally any software program that helps a business increase efficiency or measure their productivity. The term covers a large variation of uses within the business environment, and can be categorized by using a small, medium and large matrix The small business market generally consists of home accounting software, and office suites such as Microsoft Office and OpenOffice.
The medium size, or SME, has a broader range of software applications, ranging from accounting, groupware, customer relationship management, human resources software, outsourcing relationship management, loan origination software, shopping cart software, ground service software, and other yield enhancing application
The last segment covers project level software applications, such as those in the fields of enterprise resource scheduling enterprise content management business process management and product lifecycle management. These applications are wide-ranging in scope, and often come with modules that either add native functions, or incorporate the functionality of third-party software programs.
Now, technologies that have beforehand only existed in peer-to-peer software applications, like Kazaa and Napster, are starting to feature within business applications. JXTA is an open source platform that enables the creation of machine and language neutral applications.
The medium size, or SME, has a broader range of software applications, ranging from accounting, groupware, customer relationship management, human resources software, outsourcing relationship management, loan origination software, shopping cart software, ground service software, and other yield enhancing application
The last segment covers project level software applications, such as those in the fields of enterprise resource scheduling enterprise content management business process management and product lifecycle management. These applications are wide-ranging in scope, and often come with modules that either add native functions, or incorporate the functionality of third-party software programs.
Now, technologies that have beforehand only existed in peer-to-peer software applications, like Kazaa and Napster, are starting to feature within business applications. JXTA is an open source platform that enables the creation of machine and language neutral applications.
SYSTEM SOFTWARE
System software :
Device drivers
operating systems
servers
utilities
windowing systems
The purpose of systems software is to unburden the application programmer from the often complex details of the particular computer being used, including such accessories as communications devices, printers, device readers, displays and keyboards, and also to partition the computer's resources such as memory and processor time in a safe and stable manner. Examples are- Windows XP, Linux, and Mac OS X. integrated electronic environment that is available to and easily accessible by each employee and is structured to provide immediate, individualized on-line access to the full range of information, software, guidance, advice and assistance, data, images, tools, and assessment and monitoring systems to permit job performance with minimal support and intervention by others.
a computer-based system that improves worker productivity by providing on-the-job access to integrated information, advice, and learning experiences.
An electronic performance support system can also be described as any computer software program or component that improves employee performance by
Reducing the complexity or number of steps compulsory to perform a task,
providing the performance information an employee needs to perform a task, or
providing a decision support system that enables an employee to identify the action that is appropriate for a particular set of conditions.
Electronic concert Support Systems can help an society to reduce the cost of training staff while greater than ever productivity and routine It can empower an employee to achieve tasks with a minimum amount of peripheral intrusion or training. By using this type of system an employee, above all a new employee, will not only be able to inclusive their work more quickly and accurately, but as a secondary promote they will also learn more about their job and their employer's business.
EPSS must be famous from a long-established online help structure In her book, Glory Gery points out that on-line help habitually supports a single software application and is not necessarily focused on the entire range of job tasks but just that specific software. With online help, cross-referencing is often not available and the information provided is limited and rarely combined with procedures or complex tasks. Perhaps most critically, on-line help can not be customized to the user or the job task; in fact, the same software screen may require different inputs depending on the user and job task.
EPSS must also be differentiated from e-learning simulations that replay a series of steps on-demand within a software application. Simulations are more closely associated with on-demand training, not just-in-time support, because of the longer time considerations, complexity, and media restrictions for playing a simulation. Ted Gannan (2007) describes this differentiation and states that an EPSS can be considered a part of the e-learning category, as it is on-demand learning, and notes that the EPSS modality fits more within the informal learning definition.
A performance support system provides just-in-time, just enough training, information, tools, and help for users of a product or work environment, to enable optimum performance by those users when and where needed, thereby also enhancing the performance of the overall business.
In adding together to recommending consideration of an EPSS when knowledge is required to achieve individual performance in a business environment, Bezanson points out that an EPSS should be painstaking when skilled performers spend significant amount of time helping less skilled performers, when new workers must begin to perform immediately and training is impractical, unavailable or constrained, or employees need to be guided through a complex process/task that can’t be memorized. These situations often occur when new systems (e.g. Customer Relationship Management, Enterprise Resource Planning) are introduced, upgraded or consolidated, and in certain call centres when agents must perform using complex systems, processes or products
Device drivers
operating systems
servers
utilities
windowing systems
The purpose of systems software is to unburden the application programmer from the often complex details of the particular computer being used, including such accessories as communications devices, printers, device readers, displays and keyboards, and also to partition the computer's resources such as memory and processor time in a safe and stable manner. Examples are- Windows XP, Linux, and Mac OS X. integrated electronic environment that is available to and easily accessible by each employee and is structured to provide immediate, individualized on-line access to the full range of information, software, guidance, advice and assistance, data, images, tools, and assessment and monitoring systems to permit job performance with minimal support and intervention by others.
a computer-based system that improves worker productivity by providing on-the-job access to integrated information, advice, and learning experiences.
An electronic performance support system can also be described as any computer software program or component that improves employee performance by
Reducing the complexity or number of steps compulsory to perform a task,
providing the performance information an employee needs to perform a task, or
providing a decision support system that enables an employee to identify the action that is appropriate for a particular set of conditions.
Electronic concert Support Systems can help an society to reduce the cost of training staff while greater than ever productivity and routine It can empower an employee to achieve tasks with a minimum amount of peripheral intrusion or training. By using this type of system an employee, above all a new employee, will not only be able to inclusive their work more quickly and accurately, but as a secondary promote they will also learn more about their job and their employer's business.
EPSS must be famous from a long-established online help structure In her book, Glory Gery points out that on-line help habitually supports a single software application and is not necessarily focused on the entire range of job tasks but just that specific software. With online help, cross-referencing is often not available and the information provided is limited and rarely combined with procedures or complex tasks. Perhaps most critically, on-line help can not be customized to the user or the job task; in fact, the same software screen may require different inputs depending on the user and job task.
EPSS must also be differentiated from e-learning simulations that replay a series of steps on-demand within a software application. Simulations are more closely associated with on-demand training, not just-in-time support, because of the longer time considerations, complexity, and media restrictions for playing a simulation. Ted Gannan (2007) describes this differentiation and states that an EPSS can be considered a part of the e-learning category, as it is on-demand learning, and notes that the EPSS modality fits more within the informal learning definition.
A performance support system provides just-in-time, just enough training, information, tools, and help for users of a product or work environment, to enable optimum performance by those users when and where needed, thereby also enhancing the performance of the overall business.
In adding together to recommending consideration of an EPSS when knowledge is required to achieve individual performance in a business environment, Bezanson points out that an EPSS should be painstaking when skilled performers spend significant amount of time helping less skilled performers, when new workers must begin to perform immediately and training is impractical, unavailable or constrained, or employees need to be guided through a complex process/task that can’t be memorized. These situations often occur when new systems (e.g. Customer Relationship Management, Enterprise Resource Planning) are introduced, upgraded or consolidated, and in certain call centres when agents must perform using complex systems, processes or products
Monday, January 25, 2010
Dweller viruses :
Resident viruses contain a replication module that is similar to the one that is employed by nonresident viruses. This module, however, is not called by a finder module. The virus loads the imitation module into memory when it is executed instead and ensures that this module is executed each time the operating system is called to make a certain operation. The reproduction module can be called, for example, each time the operating system executes a file. In this case the virus infects every suitable program that is executed on the computer.
Resident viruses are sometimes subdivided into a kind of fast infectors and a category of slow infectors. Fast infectors are considered to infect as many files as possible. A fast infector, for instance, canister infects every potential host file that is accessed. This poses a special problem when using anti-virus software, since a virus scanner will access every potential host file on a computer when it performs a system-wide scan. If the virus scanner fails to notice that such a virus is present in memory the virus can "piggy-back" on the virus scanner and in this way infect all files that are scanned. Fast infectors rely on their fast infection rate to spread. The disadvantage of this method is that infecting many files may make detection more likely, because the virus may slow down a computer or perform many suspicious actions that can be noticed by anti-virus software. Slow infectors, on the other hand, are designed to infect hosts infrequently. Some slow infectors, for instance, only infect files when they are copied. Slow infectors are designed to avoid detection by limiting their actions: they are less likely to slow down a computer noticeably and will, at most, infrequently trigger anti-virus software that detects suspicious behavior by programs. The slow infector approach, however, does not seem very successful
Resident viruses contain a replication module that is similar to the one that is employed by nonresident viruses. This module, however, is not called by a finder module. The virus loads the imitation module into memory when it is executed instead and ensures that this module is executed each time the operating system is called to make a certain operation. The reproduction module can be called, for example, each time the operating system executes a file. In this case the virus infects every suitable program that is executed on the computer.
Resident viruses are sometimes subdivided into a kind of fast infectors and a category of slow infectors. Fast infectors are considered to infect as many files as possible. A fast infector, for instance, canister infects every potential host file that is accessed. This poses a special problem when using anti-virus software, since a virus scanner will access every potential host file on a computer when it performs a system-wide scan. If the virus scanner fails to notice that such a virus is present in memory the virus can "piggy-back" on the virus scanner and in this way infect all files that are scanned. Fast infectors rely on their fast infection rate to spread. The disadvantage of this method is that infecting many files may make detection more likely, because the virus may slow down a computer or perform many suspicious actions that can be noticed by anti-virus software. Slow infectors, on the other hand, are designed to infect hosts infrequently. Some slow infectors, for instance, only infect files when they are copied. Slow infectors are designed to avoid detection by limiting their actions: they are less likely to slow down a computer noticeably and will, at most, infrequently trigger anti-virus software that detects suspicious behavior by programs. The slow infector approach, however, does not seem very successful
Computer Virus
A computer virus is a computer plan that can copy itself and infect a computer. The term "virus" is also frequently but speciously used to refer to other types of malware, adware, and detective ware programs that do not have the reproductive ability. A true virus can only spread from one computer to another
when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive. Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer.
The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, adware, and spyware programs that do not have the reproductive ability. Malware includes computer viruses, worms, trojans, most rootkits, spyware, dishonest adware, crimeware, and other malicious and unwanted software, including true viruses. Viruses are sometimes confused with computer worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a program that appears harmless but has a hidden agenda. Worms and Trojans, like viruses, may cause harm to either a computer system's hosted data, functional performance, or networking throughput, when they are executed. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or go unnoticed.
when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive. Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer.
The term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, adware, and spyware programs that do not have the reproductive ability. Malware includes computer viruses, worms, trojans, most rootkits, spyware, dishonest adware, crimeware, and other malicious and unwanted software, including true viruses. Viruses are sometimes confused with computer worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a program that appears harmless but has a hidden agenda. Worms and Trojans, like viruses, may cause harm to either a computer system's hosted data, functional performance, or networking throughput, when they are executed. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or go unnoticed.
Friday, January 8, 2010
Hardware innovtive
Hardware of a modern Personal Computer:
1. Monitor
2. Motherboard
3. CPU
4. RAM Memory
5. Expansion card
6. Power supply
7. Optical disc drive
8. Hard Disk
9. Keyboard
10. Mouse
1. Monitor
2. Motherboard
3. CPU
4. RAM Memory
5. Expansion card
6. Power supply
7. Optical disc drive
8. Hard Disk
9. Keyboard
10. Mouse
Inside a custom computer:
The motherboard is the main component indoors the case. It is a large rectangular board with integrated circuitry that connect the rest of the parts of the computer including the CPU, the RAM, the disk drives as well as any peripherals connected via the ports or the expansion slots. Computer Hardware course is very main in future being b'coz every work done by computer.
Components directly attached to the motherboard include:
The central processing unit (CPU) performs most of the calculations which enable a computer to function, and is sometimes referred to as the "brain" of the computer. It is usually cooled by a heat sink and fan.
The chip set mediates communication between the CPU and the other components of the system, including main memory.
RAM Stores all running processes (applications) and the current running OS. RAM Stands for Random Access Memory
The BIOS includes boot firmware and power management. The Basic Input Output System tasks are handled by operating system drivers.
Internal Buses connect the CPU to various internal components and to expansion cards for graphics and sound.
Current
The north bridge memory controller, for RAM and PCI Express
PCI Express, for expansion cards such as graphics and physics processors, and high-end network interfaces
PCI, for other expansion cards
SATA, for disk drives
Obsolete
ATA (superseded by SATA)
AGP (superseded by PCI Express)
VLB VESA Local Bus (superseded by AGP)
ISA (expansion card slot format obsolete in PCs, but still used in industrial computers)
External Bus Controllers
support ports for external peripherals. These ports may be controlled directly by the south bridge I/O controller or based on expansion cards attached to the motherboard through the PCI bus.
USB
FireWire
eSATA
SCSI
Power supply
A power supply unit (PSU) is the section that supplies influence to the other components in a computer. More specifically, a power supply unit is typically considered to convert general-purpose alternating current (AC) electric power from the mains (100-127V in North America, parts of South America, Japan, and Taiwan; 220-240V in most of the rest of the world) to usable low-voltage DC power for the internal components of the computer. Some power supplies have a switch to change between 230 V and 115 V. Other models have automatic sensors that switch input energy automatically, or are able to accept any voltage between those limits.
The motherboard is the main component indoors the case. It is a large rectangular board with integrated circuitry that connect the rest of the parts of the computer including the CPU, the RAM, the disk drives as well as any peripherals connected via the ports or the expansion slots. Computer Hardware course is very main in future being b'coz every work done by computer.
Components directly attached to the motherboard include:
The central processing unit (CPU) performs most of the calculations which enable a computer to function, and is sometimes referred to as the "brain" of the computer. It is usually cooled by a heat sink and fan.
The chip set mediates communication between the CPU and the other components of the system, including main memory.
RAM Stores all running processes (applications) and the current running OS. RAM Stands for Random Access Memory
The BIOS includes boot firmware and power management. The Basic Input Output System tasks are handled by operating system drivers.
Internal Buses connect the CPU to various internal components and to expansion cards for graphics and sound.
Current
The north bridge memory controller, for RAM and PCI Express
PCI Express, for expansion cards such as graphics and physics processors, and high-end network interfaces
PCI, for other expansion cards
SATA, for disk drives
Obsolete
ATA (superseded by SATA)
AGP (superseded by PCI Express)
VLB VESA Local Bus (superseded by AGP)
ISA (expansion card slot format obsolete in PCs, but still used in industrial computers)
External Bus Controllers
support ports for external peripherals. These ports may be controlled directly by the south bridge I/O controller or based on expansion cards attached to the motherboard through the PCI bus.
USB
FireWire
eSATA
SCSI
Power supply
A power supply unit (PSU) is the section that supplies influence to the other components in a computer. More specifically, a power supply unit is typically considered to convert general-purpose alternating current (AC) electric power from the mains (100-127V in North America, parts of South America, Japan, and Taiwan; 220-240V in most of the rest of the world) to usable low-voltage DC power for the internal components of the computer. Some power supplies have a switch to change between 230 V and 115 V. Other models have automatic sensors that switch input energy automatically, or are able to accept any voltage between those limits.
Subscribe to:
Posts (Atom)