Most Interesting Computer facts

Here is a collection of 25 Most Interesting
Computer Facts featuring Funny Computer Facts,I
nternet facts,virus facts and more Computer Fun
Facts.
1. 80% of all pictures on the internet are of naked
women
2. Another name for a Microsoft Windows tutorial is
‘Crash Course’!
3. Bill Gates house was designed using a
Macintosh computer.
4. By the year 2012 there will be approximately 17
billion devices connected to the Internet.
5. Domain names are being registered at a rate of
more than one million names every month.
6. E-mail has been around longer than the World
Wide Web.
7. For every ‘normal’ webpage, there are five porn
pages.
8. In the 1980s, an IBM computer wasn’t
considered 100% compatible unless it could run
Microsoft Flight Simulator*.
9. MySpace reports over 110 million registered
users. Were it a country, it would be the tenth
largest, just behind Mexico.
10. One of every 8 married couples in the US last
year met online.
11. The average 21 year old has spent 5,000 hours
playing video games, has exchanged 250,000 e-
mails, instant and text messages and has spent
10,000 hours on the mobile phone.
12. The average computer user blinks 7 times a
minute, less than half the normal rate of 20.
13. The first banner advertising was used in 1994.
14. The first computer mouse was invented by
Doug Engelbart in around 1964 and was made of
wood.
15. The first domain name ever registered was
Symbolics.com.
16. The world’s first computer, called the Z1, was
invented by Konrad Zuse in 1936. His next
invention, the Z2 was finished in 1939 and was the
first fully functioning electro-mechanical computer.
17. There are approximately 1,319,872,109 people
on the Internet.
18. There are approximately 1.06 billion instant
messaging accounts worldwide.
19. While it took the radio 38 years, and the
television a short 13 years, it took the World Wide
Web only 4 years to reach 50 million users.
20.70% of virus writers work under contract for
organized crime syndicates.
21.A program named “Rother J” was the first
computer virus to come into sight “in the wild” —
that is, outside the single computer or lab where it
was created.
22.The worst MS-DOS virus ever, Michelangelo
(1991) attacked the boot sector of your hard drive
and any floppy drive inserted into the computer,
which caused the virus to spread rapidly.
23.A virus can not appear on your computer all by
iself. You have to get it by sharing infected files or
diskettes, or by downloading infected files from the
Internet.
24. Country with the highest percentage of net
users is Sweden (75%).
25. The first popular web browser was called
Mosaic and was released in 1993

Most Important Question for a post in Software Company

What is the Difference between C and C++?
C
1. C is Procedural Language.
2. No virtual Functions are present in C
3. In C, Polymorphism is not possible.
4. Operator overloading is not possible in C.
5. Top down approach is used in Program Design.
6. No namespace Feature is present in C Language.
7. Multiple Declaration of global variables are allowed.
8. In C
• scanf() Function used for Input.
• printf() Function used for output.
9. Mapping between Data and Function is difficult and complicated.
10. In C, we can call main() Function through other Functions
11. C requires all the variables to be defined at the starting of a scope.
12. No inheritance is possible in C.
13. In C, malloc() and calloc() Functions are used for Memory Allocation and free() function for memory Deallocating.
14. It supports built-in and primitive data types.
15. In C, Exception Handling is not present.

C++
1. C++ is non Procedural i.e Object oriented Language.
2. The concept of virtual Functions are used in C++.
3. The concept of polymorphism is used in C++.
Polymorphism is the most Important Feature of OOPS.
4. Operator overloading is one of the greatest Feature of C++.
5. Bottom up approach adopted in Program Design.
6. Namespace Feature is present in C++ for avoiding Name collision.
7. Multiple Declaration of global varioables are not allowed.
8. In C++
• Cin>> Function used for Input.
• Cout<< Function used for output.
9. Mapping between Data and Function can be used using "Objects"
10. In C++, we cannot call main() Function through other functions.
11. C++ allows the declaration of variable anywhere in the scope i.e at time of its First use.
12. Inheritance is possible in C++
13.In C++, new and delete operators are used for Memory Allocating and Deallocating.
14. It support both built-in and user define data types.
15. In C++, Exception Handling is done with Try and Catch block.

Removing Trojan Method

Removing trojans manually
Following are the ways you can remove trojans from your system:

Method 1.
You can download some explorer software like process explorer. This software will clearly list all the process running on your pc. The tool is required as many trojans stay hidden from the taskmanager. Well run the process explorer. Then look for processes that are highlighted pink. Right click on that process and select kill process tree. Then go to the location the file is mentioned at and delete the file.

Method2.
Start the command prompt.
step1. enter the command
netstat -a -b -n
This would list all the connections on the pc. The connections are always shown in the format of IP:port number
And all trojans work on UDP ports hence you can trace the non-reliable connections easily.
step2. look up the PID of the processes and then from the task manager end the process which is non-reliable

or

you can also use the command

netstat -no

this would list out all the live connections on the pc.
next to kill a particular process.

taskkill /PID 1234
here 1234 should be the pid of the suspicious process.

NASA radio waves News

The National Security Agency is using secret wireless technology that allows it to access and alter data on computers, even when they are not connected to the Internet, according to a New York Times report.

Since 2008, the agency has been increasingly using a "covert channel of radio waves" that can transmit from hardware installed in the computers, according to NSA documents and experts interviewed by the Times. Signals can then be sent to briefcase-size relay stations miles away, according to the report.

The NSA has also installed surveillance software on nearly 100,000 computers around the world, according to the Times. The newspaper said the Chinese Army was a frequent target of such technology but said there was no evidence that the agency used either technology inside the US.

Repeating earlier denials that its data collection activities are arbitrary or unconstrained, the NSA rejected any comparison to Chinese attackers who have been accused to planting similar software on computers belonging to US companies and government agencies.

"NSA's activities are focused and specifically deployed against -- and only against -- valid foreign intelligence targets in response to intelligence requirements," the NSA said in a statement. "In addition, we do not use foreign intelligence capabilities to steal the trade secrets of foreign companies on behalf of -- or give intelligence we collect to -- U.S. companies to enhance their international competitiveness or increase their bottom line."

The surveillance agency also asserted that a complex web of laws, regulations, and policies governed its use of such tools and that "continuous and selective publication" of the agency's techniques was "detrimental to the security of the United States and our allies."

Last month, a Der Spiegel report detailed how the agency's Office of Tailored Access Operations intercepts deliveries of electronic equipment to plant spyware to gain remote access to the systems once they are delivered and installed. According to that report, the NSA has planted backdoors to access computers, hard drives, routers, and other devices from companies such as Cisco, Dell, Western Digital, Seagate, Maxtor, Samsung, and Huawei.

The German news magazine also described a 50-page product catalog of tools and techniques used by a program called ANT, which stands for Advanced or Access Network Technology, to send and receive signals to devices.

President Obama is expected to announce on Friday the changes to the NSA he is expected to adopt based on recommendations from a presidential task force. The panel, which was appointed by President Obama in the wake of disclosures made this summer by former NSA contractor Edward Snowden, has reportedly proposed stricter standards for NSA data searches and that a third party be responsible for storing phone records collected by the agency.

Hack Codes For iphone 4 or 4s

Hello friends, today i am going to share all the available secret hack codes for iPhone 4 or iPhone 4S. These secret hack codes will help you to hack the iPhone and helps you to explore the internal settings of your iPhone.

Secret codes are actually those codes which are not known(hidden) to general users, usually Geeks use these codes as their shortcuts to browse the internal settings and perform their exploits. As we all know iPhone is quite secured and there are very less hack codes available for the same but don't worry Guys i come up with all the available hacking codes that works on iPhone 4 or 4S. You can also try these hack codes on previous models as i have tested them only of iPhone 4 and iPhone 4S. Some of them works on iPhone 4 and some on iPhone 4S and some are specific to operator. So please don't complain if any of them didn't work for you.. All codes are tested personally and are 100% working..

Note: Some of codes will require tapping of call key on your iPhone, actually most of them require call button + tap(means slide it). So if any code doesn't work just by dialing, you just need to tap the call key and it will work. Infact except the IMEI number one hack code all require call + tap.

Secret Hack Codes for iPhone 4 or iPhone 4S
*#43#
Use to verify if call waiting is enabled

*#61#
Verify the number for unanswered calls

*#62#
Verify the number for call forwarding if no service is available.

*#67#
Verify the number for call forwarding if phone is busy

*#33#
To verify whether barring is enabled or disabled for outgoing

*#21#
To display the settings for your call forwarding

*3001#12345#*
Enters Field mode which allows you to access most of the hidden settings and functions of your iPhone.

*#06#
Display the IMEI of your iPhone, as always this is the standard code for all brands of phones.

*225#
Displays the account balance for postpaid contracts.

*777#
Displays the account balance for prepaid accounts.

*646#
Displays the remaining minutes available.

*3282#
Get your data usage information.

*729
Options to make payments. Its operator specific.

611
Dials customer service, (114 in RSA for Vodacom). Its operator specific.

*#30#
This shows whether you have enabled or disabled the presentation of the calling line, presumably the number of the party placing the call.

*#76#
State whether the connected line presentation is enabled or disabled. Similar to the calling line presentation.
Note: This is the list of all iPhone codes available till now in market. If hope i haven't even missed the one. If still you are able to find any extra hack code for iPhone 4 or iPhone 4S then don't hesitate in sharing, as Sharing is Caring.

Trace IP using email

Track IP address of anyone using email.

Using This method you can get the IP address,location, timing of victim.

How to track IP address?

step 1: Know what is your victim email id.

For eg: victimid[@]gmail.com

step 2: Register an account here: http://www.readnotify.com/

step 3: Send mail to victim using your readnotify.com mail account. Before sending mail append ".readnotify.com" at end of victim mail ID.

For eg: victimid[@]gmail.com.readnotify.com

step 4:If victim opens the mail, his info will be tracked(IP address) and mailed to your account.

Computer Crash Reasons

10 reasons why Computer Crash you must know:)

Fatal error: the system has become unstable or is busy," it says. "Enter to return to Windows or press Control-Alt-Delete to restart your computer. If you do this you will lose any unsaved information in all open applications."

You have just been struck by the Blue Screen of Death. Anyone who uses Microsoft Windows will be familiar with this. What can you do? More importantly, how can you prevent it happening?

1 Hardware conflict

The number one reason why Windows crashes is hardware conflict. Each hardware device communicates to other devices through an interrupt request channel (IRQ). These are supposed to be unique for each device.

For example, a printer usually connects internally on IRQ 7. The keyboard usually uses IRQ 1 and the floppy disk drive IRQ 6. Each device will try to hog a single IRQ for itself.

If there are a lot of devices, or if they are not installed properly, two of them may end up sharing the same IRQ number. When the user tries to use both devices at the same time, a crash can happen. The way to check if your computer has a hardware conflict is through the following route:

* Start-Settings-Control Panel-System-Device Manager.

Often if a device has a problem a yellow '!' appears next to its description in the Device Manager. Highlight Computer (in the Device Manager) and press Properties to see the IRQ numbers used by your computer. If the IRQ number appears twice, two devices may be using it.

Sometimes a device might share an IRQ with something described as 'IRQ holder for PCI steering'. This can be ignored. The best way to fix this problem is to remove the problem device and reinstall it.

Sometimes you may have to find more recent drivers on the internet to make the device function properly. A good resource iswww.driverguide.com. If the device is a soundcard, or a modem, it can often be fixed by moving it to a different slot on the motherboard (be careful about opening your computer, as you may void the warranty).

When working inside a computer you should switch it off, unplug the mains lead and touch an unpainted metal surface to discharge any static electricity.

To be fair to Mcft, the problem with IRQ numbers is not of its making. It is a legacy problem going back to the first PC designs using the IBM 8086 chip. Initially there were only eight IRQs. Today there are 16 IRQs in a PC. It is easy to run out of them. There are plans to increase the number of IRQs in future designs.

2 Bad Ram

Ram (random-access memory) problems might bring on the blue screen of death with a message saying Fatal Exception Error. A fatal error indicates a serious hardware problem. Sometimes it may mean a part is damaged and will need replacing.

But a fatal error caused by Ram might be caused by a mismatch of chips. For example, mixing 70-nanosecond (70ns) Ram with 60ns Ram will usually force the computer to run all the Ram at the slower speed. This will often crash the machine if the Ram is overworked.

One way around this problem is to enter the BIOS settings and increase the wait state of the Ram. This can make it more stable. Another way to troubleshoot a suspected Ram problem is to rearrange the Ram chips on the motherboard, or take some of them out. Then try to repeat the circumstances that caused the crash. When handling Ram try not to touch the gold connections, as they can be easily damaged.

Parity error messages also refer to Ram. Modern Ram chips are either parity (ECC) or non parity (non-ECC). It is best not to mix the two types, as this can be a cause of trouble.

EMM386 error messages refer to memory problems but may not be connected to bad Ram. This may be due to free memory problems often linked to old Dos-based programmes.

3 BIOS settings

Every motherboard is supplied with a range of chipset settings that are decided in the factory. A common way to access these settings is to press the F2 or delete button during the first few seconds of a boot-up.

Once inside the BIOS, great care should be taken. It is a good idea to write down on a piece of paper all the settings that appear on the screen. That way, if you change something and the computer becomes more unstable, you will know what settings to revert to.

A common BIOS error concerns the CAS latency. This refers to the Ram. Older EDO (extended data out) Ram has a CAS latency of 3. Newer SDRam has a CAS latency of 2. Setting the wrong figure can cause the Ram to lock up and freeze the computer's display.

Mcft Windows is better at allocating IRQ numbers than any BIOS. If possible set the IRQ numbers to Auto in the BIOS. This will allow Windows to allocate the IRQ numbers (make sure the BIOS setting for Plug and Play OS is switched to 'yes' to allow Windows to do this.).

4 Hard disk drives

After a few weeks, the information on a hard disk drive starts to become piecemeal or fragmented. It is a good idea to defragment the hard disk every week or so, to prevent the disk from causing a screen freeze. Go to

* Start-Programs-Accessories-System Tools-Disk Defragmenter

This will start the procedure. You will be unable to write data to the hard drive (to save it) while the disk is defragmenting, so it is a good idea to schedule the procedure for a period of inactivity using the Task Scheduler.

The Task Scheduler should be one of the small icons on the bottom right of the Windows opening page (the desktop).

Some lockups and screen freezes caused by hard disk problems can be solved by reducing the read-ahead optimisation. This can be adjusted by going to

* Start-Settings-Control Panel-System Icon-Performance-File System-Hard Disk.

Hard disks will slow down and crash if they are too full. Do some housekeeping on your hard drive every few months and free some space on it. Open the Windows folder on the C drive and find the Temporary Internet Files folder. Deleting the contents (not the folder) can free a lot of space.

Empty the Recycle Bin every week to free more space. Hard disk drives should be scanned every week for errors or bad sectors. Go to

* Start-Programs-Accessories-System Tools-ScanDisk

Otherwise assign the Task Scheduler to perform this operation at night when the computer is not in use.

5 Fatal OE exceptions and VXD errors

Fatal OE exception errors and VXD errors are often caused by video card problems.

These can often be resolved easily by reducing the resolution of the video display. Go to

* Start-Settings-Control Panel-Display-Settings

Here you should slide the screen area bar to the left. Take a look at the colour settings on the left of that window. For most desktops, high colour 16-bit depth is adequate.

If the screen freezes or you experience system lockups it might be due to the video card. Make sure it does not have a hardware conflict. Go to

* Start-Settings-Control Panel-System-Device Manager

Here, select the + beside Display Adapter. A line of text describing your video card should appear. Select it (make it blue) and press properties. Then select Resources and select each line in the window. Look for a message that says No Conflicts.

If you have video card hardware conflict, you will see it here. Be careful at this point and make a note of everything you do in case you make things worse.

The way to resolve a hardware conflict is to uncheck the Use Automatic Settings box and hit the Change Settings button. You are searching for a setting that will display a No Conflicts message.

Another useful way to resolve video problems is to go to

* Start-Settings-Control Panel-System-Performance-Graphics

Here you should move the Hardware Acceleration slider to the left. As ever, the most common cause of problems relating to graphics cards is old or faulty drivers (a driver is a small piece of software used by a computer to communicate with a device).

Look up your video card's manufacturer on the internet and search for the most recent drivers for it.

6 Viruses

Often the first sign of a virus infection is instability. Some viruses erase the boot sector of a hard drive, making it impossible to start. This is why it is a good idea to create a Windows start-up disk. Go to

* Start-Settings-Control Panel-Add/Remove Programs

Here, look for the Start Up Disk tab. Virus protection requires constant vigilance.

A virus scanner requires a list of virus signatures in order to be able to identify viruses. These signatures are stored in a DAT file. DAT files should be updated weekly from the website of your antivirus software manufacturer.

An excellent antivirus programme is McAfee VirusScan by Network Associates ( www.nai.com). Another is Norton AntiVirus 2000, made by Symantec ( www.symantec.com).

7 Printers

The action of sending a document to print creates a bigger file, often called a postscript file.

Printers have only a small amount of memory, called a buffer. This can be easily overloaded. Printing a document also uses a considerable amount of CPU power. This will also slow down the computer's performance.

If the printer is trying to print unusual characters, these might not be recognised, and can crash the computer. Sometimes printers will not recover from a crash because of confusion in the buffer. A good way to clear the buffer is to unplug the printer for ten seconds. Booting up from a powerless state, also called a cold boot, will restore the printer's default settings and you may be able to carry on.

8 Software

A common cause of computer crash is faulty or badly-installed software. Often the problem can be cured by uninstalling the software and then reinstalling it. Use Norton Uninstall or Uninstall Shield to remove an application from your system properly. This will also remove references to the programme in the System Registry and leaves the way clear for a completely fresh copy.

The System Registry can be corrupted by old references to obsolete software that you thought was uninstalled. Use Reg Cleaner by Jouni Vuorio to clean up the System Registry and remove obsolete entries. It works on Windows 95, Windows 98, Windows 98 SE (Second Edition), Windows Millennium Edition (ME), NT4 and Windows 2000.

Read the instructions and use it carefully so you don't do permanent damage to the Registry. If the Registry is damaged you will have to reinstall your operating system. Reg Cleaner can be obtained from www.jv16.org

Often a Windows problem can be resolved by entering Safe Mode. This can be done during start-up. When you see the message "Starting Windows" press F4. This should take you into Safe Mode.

Safe Mode loads a minimum of drivers. It allows you to find and fix problems that prevent Windows from loading properly.

Sometimes installing Windows is difficult because of unsuitable BIOS settings. If you keep getting SUWIN error messages (Windows setup) during the Windows installation, then try entering the BIOS and disabling the CPU internal cache. Try to disable the Level 2 (L2) cache if that doesn't work.

Remember to restore all the BIOS settings back to their former settings following installation.

9 Overheating

Central processing units (CPUs) are usually equipped with fans to keep them cool. If the fan fails or if the CPU gets old it may start to overheat and generate a particular kind of error called a kernel error. This is a common problem in chips that have been overclocked to operate at higher speeds than they are supposed to.

One remedy is to get a bigger better fan and install it on top of the CPU. Specialist cooling fans/heatsinks are available fromwww.computernerd.com or www.coolit.com

CPU problems can often be fixed by disabling the CPU internal cache in the BIOS. This will make the machine run more slowly, but it should also be more stable.

10 Power supply problems

With all the new construction going on around the country the steady supply of electricity has become disrupted. A power surge or spike can crash a computer as easily as a power cut.

If this has become a nuisance for you then consider buying a uninterrupted power supply (UPS). This will give you a clean power supply when there is electricity, and it will give you a few minutes to perform a controlled shutdown in case of a power cut.

It is a good investment if your data are critical, because a power cut will cause any unsaved data to be lost.