HIDE A FOLDER AND FILE WITH USING CMD FOR THOSE WHO WANT TO CHEAT IN LAB EXAMS

1) To hide file  
Open cmd   type command:attrib filename  +s  +h +a
you have to specify the PATH at palce of filename and press enter and 
it all done file will hide no one can see 
if you want to open that file you have to remember the file name 
2) to rehide the file:
 Open cmd type command:attrib filename  -s -h -a  
You have to specify the PATH at palce of filename and press enter 
it will open :)
 enjoy :)