My friend at school done something on notepad and saved them as bat files and he took a sheet containing everyones user names and passwords and logged on as them and did something with bat files. He got into a lot of trouble because i think he deleted peoples work. But i just want to know what they are.

From Wikipedia:

http://en.wikipedia.org/wiki/BAT_file

 

;)

Cheers

Someone did that at college (stuck key loggers on the software so when people logged in they got the username and password), now you have to press alt-control & delete before entering your password

Well he done something on mine and it ended up as a little icon and when you clicked it the pc shut down but there was another one which deleted all of your work which i think he did to someone. Luckily everyones work is stored by the IT guys. But he did get in a hell of a lot of trouble and had to write a letter of apology.