Virus, Trojan, Worm

Q: What is the difference between a Virus, Trojan, and Worm?
A: Basically, they all fall under the generally category of "viruses". However, there are a few distinctions.

Virus - Technically, a virus infects another file (attaches or inserts itself into it). They usually infect program files or MS Office documents. From there, it can replicate, do damage, etc. Unlike a worm, these do not function as a stand alone (except possibly to infect a given file).

Worm - This is almost identical to a "true virus", except that it lives on its own and generally doesn't infect other files (although it can replace them). Usually, these copy themselves using e-mail, networks, disks, etc. Again, these are very close to a true virus, and can do the same kind of damage.

Trojan Horse - This type of program doesn't copy itself but does do damage to your computer. These types of programs rely on people to pass them around and to run them. They do not e-mail themselves. The idea is to make the program look like it's something harmless, like a screen saver or joke, so it gets sent around. That's the crash course on virus types. Bottom line, you don't want any of the little nastys on your computer!

Hidden surprise in windows XP.

• Pinball is one of the fun games in windows XP.
  To get Extra balls type ‘1max’ at the start of a new game. Better still, to increase your ranking without even playing the game, simply type ‘rmax’ at the beginning of a new game to go up in ranks.
  
• Want to win a game of solitaire with tapping on just three keys on your keyboards?
  While no one’s looking simply job the magic combination ‘Alt + Shift + 2’ and whoosh!! All your cards will obediently go in their appropriate places.

Motorola Secret Codes.

Note: [] (pause) means the * key held in until box appears.

Select phone line - (use this to write things below the provider name):
[] [] [] 0 0 8 [] 1 []
Add phonebook to main menu:
[] [] [] 1 0 5 [] 1 []
Add messages to main menu:
[] [] [] 1 0 7 [] 1 []
Copy SIM memory (phonebook menu):
[] [] [] 1 0 8 [] 1 []
Eng Field options (main menu):
[] [] [] 1 1 3 [] 1 []
Slow (Frequency of search menu):
[] [] [] 1 0 1 [] 1 []
Medium (Frequency of search menu):
[] [] [] 1 0 2 [] 1 []
Fast (Frequency of search menu):
[] [] [] 1 0 3 [] 1 []
Enable EFR:
[] [] [] 1 1 9 [] 1 []
Function :
[] [] [] # # # [] 1 []
Change pin:
[] [] [] 0 0 4 [] 1 []
Unblocking using the "puk" number:
[] [] [] 0 0 5 [] 1 []
There are lots of similar codes exist. If you change the last number to 0 you can deactive that code. The 3 digit number at the middle are from 0 to 999. I put the most interesting codes. (EFR):Enhanced Full Rate Codec.
You can change GSM frequencies to 900/1800 by entering the enginnering model. Following the below steps:
enter menu and press 048263* quickly, then you will enter the secret engineering menu
under "Opcode"
input 10*0*3 for GSM 900
10*0*4 for GSM 1800
10*0*5 for GSM 1900
10*0*6 for dual band GSM 900/1800
10*0*7 for dual band GSM 850/1900

To add extra message space 4 your Motorola C350 C450 C550 or C650, press menu button, press 048263* quickly, then on the popup menu enter 47 press ok.press 50 and ok.press 1 ok.press 64 ok.press 1 ok.press 186 and ok.You will receive an extra 50 msgs memory space.Switch phone off and back on

How to Turn Your Num Lock On Forever?

You can set your Num Lock to stay on by default when you logon your system.

There are two different techniques to set Num Lock stay on by default.

• If you can use Registry Editor correctly then Click on start button and type Regedt32.exe in Run command. Here Navigate to HKEY_USERS\.Default\Control Panel\Keyboard and change the value for InitialKeyboardIndicators from 0 to 2.

• You can do same by configuring the script to change the NUM LOCK state. Click Start button and then open Notepad. Copy the giving code and paste in Notepad. set WshShell = CreateObject("WScript.Shell") WshShell.SendKeys "{NUMLOCK}"

Now save this file with name "num.vbs" must including the quotes. At the end copy this file to user startup folder. The path for this folder is Documents and Settings\All Users\Start Menu\Programs\Startup.

Now restart the computer. Num Lock should come on and stay on.

Quick Format Vs Default Format

Today tip about formatting your Hard disk partitions. When you ready to format you partitions, you have two methods to format a partition, you can work with default formatting and other quick format method.
When you first time format your system partition, you should use default method. This is slow and low-level formatting but with this method you can remove all data from the partition as well as the hard disk is scanned for bad sectors. Here you can fix your system bad sectors. If you select the quick format method, you can save time but you can remove only data from the partition and does not scan the disk for bad sectors. If you sure about your hard disk health then quick format should be fine to remove data with in short time.

What is Bluetooth Technology?

Bluetooth is a wireless technology that enables any electrical device to wirelessly communicate in the range of 2.5 GHz ISM frequency band. Mobile phones, headsets, PDA's and portable computers can communicate and send data to each other without wires or cables to link to devices together. The name of Bluetooth derived from the name of an English king Harold Bluetooth.

It a low cost, low power, radio technology, which is particularly suited to the short range Personal Area Network (PAN) application. Bluetooth Special Interest Group is authorized to develop its specifications & license.

The Main Features of Bluetooth are given below:

• It operates in the 2.4GHz frequency band without having a license for wireless communication.
• Up to 10-100 meters data can be transfer in real time.
• Close proximity & accuracy is not required for Bluetooth as in case of infrared data (IrDA) communication device. Bluetooth does not suffer from interference from obstacles such as walls while infrared suffers due to obstacles.
• Bluetooth supports both point-to-point and point-to-multipoint wireless connections without cables between mobile phones and personal computers.
• Data transfer rate of blue tooth varies from version to version. Data rate of 1 Mbps for Version 1.2 Up to 3 Mbps for Version 2.0.

Then major parts of Bluetooth system are RF transceiver, base band, and protocol stack. Bluetooth is used for small-area networking without user intervention. Due to extremely low transmission power in Bluetooth technique battery power is saved. It is a networking standard that works at two levels:

· Physical level.

· Protocol level

Due to these levels mobiles have to agree on these levels when bits are sent. It decides the amount of data to be sent at a time, and how the parties in a conversation can be sure that the message received is the same as the message sent.

Bluetooth networking transmits data through low-power radio waves. It can connect up to eight devices simultaneously. With in the range of about ten meters you must think that the devices will not interfere with each other. Bluetooth solved the problem of devices interference while sending the data by using the technique of Spread-Spectrum Frequency Hopping due to which devices may transfer data at the same frequency at the same time. The question rises here is how Bluetooth send the same data using same frequency band without devices interferences? In Bluetooth technique, transmitters change frequencies 1,600 times in every second. In this way devices can make full use of a limited band of the radio spectrum.

When Bluetooth devices came into the range of each other, conversations take place automatically. This conversation automatically determines whether they have the data to share or not. In this way Bluetooth devices not only share the data but also control the data to be transferred. When the connection is established, the devices either they are part of a computer system or a network, Bluetooth systems create a personal-area network.

The technology used in Bluetooth also provides security in three ways:

· Pseudo-random frequency hopping,

· Authentication,

· Encryption

Frequency hops make it difficult for anyone to eavesdrop. Authentication allows a user to limit connectivity to specified devices. Encryption uses secret keys to make data intelligible only to authorized parties.

Service-level security and device-level security work together to protect Bluetooth devices from unauthorized data transmission.

Many serious problems create only due to improper security issues. Some of them are given below:

• Blue jacking
• Blue bugging
• Car Whisperer

Blue Jacking

It is used to send a business card in the form of text message via Bluetooth to other users. It should be noted that the distance between two users is not more than 10 meters. If the user doesn't found the proper text, he should add the contact to his phone book. After saving his contact in his address book retry to send the same message. In this way the user can get business card from other user via Bluetooth. It’s all because of the known destination from where the massage is being coming.

Blue Bugging

Due to this hackers can access user’s phone. It not only access one’s mobile phone, but also use its features including placing call, messaging. Even though the user doesn't realize it’s happening.

Car Whisperer

Car whisper is a type of software due to which hackers can send and receive audio file from a Bluetooth-enabled car stereo.

Print and Edit Through DOS Mode

If you are working at the Command Prompt your can modify and print the text file very easily. There are different ways to print text a file while working at the Command Prompt. Assuming the file you want to print is in your current folder, you can type here with your file name with extension. For example

print filename.txt

and press Enter. Here .txt is the file extension. You must use the extension. Now in the same way you can edit this file before printing with given command

edit filename.txt

and press Enter. This command opens the MS-DOS Editor to edit this file. Edit the file and then press Alt, F, P to print it.