LOCK/UNLOCK COMPUTER WITH PENDRIVE

Just follow the steps as given below :- 
Insert your USB drive into your system and wait for it to be recognized..

STEP1:-Go to Start >
Control Panel >
Administrative Tools >
Computer Management >
Disk Management >
Or
You can go directly by typing the command in run: diskmgmt.msc

 Then right-click the partition whose name you want to change (click in the white area just below the word “Volume”) and select “change drive letter and paths.”

From here you can re-assign the drive letter it was given to “A”
NOTE:Drive letter of pendrive must be "A"

STEP2:- Start->Run->syskey

click on "ok"

Syskey launched: Click “Update”

Choose “Store Startup key on floppy disk” and click “OK”

You’ll be prompted to enter your diskette. Make sure your USB drive is inserted and writable.
Restart and have fun. Don’t lose your USB disk! Also, to revert this, you can run syskey again and choose to store it locally instead of “on a floppy disk”.

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OPEN CMD WITH RIGHT CLICK.

Just hold down the Shift key and right-click on the desktop…

And then you can choose “Open Command Window Here” from the menu. The great thing about this is that the current path is the desktop, which is convenient for manipulating files on the desktop.

Of course you can always right-click on any folder icon in the system while holding down the shift key:
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HOW TO CHANGE DRIVE LETTER.

To change drive letters ...
Just follow the steps as given below :- 
Go to Start >
Control Panel >
Administrative Tools >
Computer Management >
Disk Management >
Or
You can go directly by typing the command in run: diskmgmt.msc
Then right-click the partition whose name you want to change (click in the white area just below the word “Volume”) and select “change drive letter and paths.” From here you can add, remove or change drive letters and paths to the partition.
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HOW TO HIDE TEXT BEHIND IMAGE(STEGANOGRAPHY)

What is Steganography?
Steganography is the technique of hiding confidential information within any media.

Just follow the steps as given below :- 
First copy any Image to your C: directory
Open cmd by going Start-Run program- type cmd (Administrative mode)

Type command cd\ in cmd press enter.
Now write command as:
echo “your text to hide” >> image.jpg
change 'you text to hide' to your message and also name of the image.

 Now go to your image and open it with Notepad and you will your hidden message at the end of the image file contents.

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HOW TO CHANGE FOLDER BACKGROUND

TRICK TO CHANGE FOLDER BACKGROUND

1. Open Command Prompt and set folder attribute to "system". Suppose there is a folder "Sunny" in "E:\" drive, in which you want to set a wallpaper as background image.
TYPE.:  attrib +s E:\Sunny

2. Now open Notepad and paste following code:

[ExtShellFolderViews]
{BE098140-A513-11D0-A3A4-00C04FD706EC} = {BE098140-A513-11D0-A3A4-00C04FD706EC}
[{BE098140-A513-11D0-A3A4-00C04FD706EC}]
Attributes=1
IconArea_Image=D:\Wallpaper\Image1.jpg
IconArea_Text=0x00000000

Now change "path_of_the_wallpaper" to the exact path of the wallpaper which you want to set as background. Suppose the wallpaper is stored in "D:\Wallpaper\Image1.jpg".

3. Now save the file with name "Desktop.ini" (including quotes) and copy the file in the desired folder which is "Sunny" in our example.
4. Thats it. Close the folder and re-open it. Now it should show the wallpaper as background.

IconArea_Text
Black - 0x00000000
White - 0x00FFFFFF
Green - 0x0000FF00
Blue - 0x00FF0000
Purple - 0x00C000C0
Red - 0x000000FF
Yellow - 0x0000FFFF
Indigo - 0x00FFFF00
NOTE: This trick works only in windows xp.
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HOW TO MAKE AN UNDELETABLE FOLDER

1. Open cmd ( Type in Run option, the command 'cmd' or navigate to All Programs->Accessories-> Command Prompt)

2. In cmd,change the directory that you want. for example to change from your current drive to D drive (Type D:)

3. Type md \lpt1\\ and press enter, the folder now will be in your D:

4. If you try to delete or rename it, it will appear error message

5. If you want to delete it just go to 'cmd', navigate to the directory and type rd \lpt1\\ and press Enter.

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SECURE YOUR WINDOWS WITH SYSKEY

SECURE YOUR WINDOWS WITH SYSKEY

Microsoft uses a file called sam to store the sam data on windows NT

SAM(SECURITY ACCOUNT MANAGER)-It stores the hases of password.

Protect your sam file use syskey.

To enable syskey in windows go to run

Type syskey

sam lock tool will open

click on update

a dialog box will open named startup key

click on radio button password startup

enter password and click ok.

now next time u start your computer it will ask for password.

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