@ kamurigo
1) Its true that you cant create a folder called CON in windows but here,the explanation! CON is a reserved system command in Windows DOS. The same way you cant create a folder named LPT1,AUX,PRN,COM1 etc
2) On the notepad thing,again you are very right. Its a known bug but i cant pretend to have an explanation though i can add a thing. My lecturer called it 4-3-3-5 bug. In fact it works with ANY 4 words with 4,3,3 and 5 alphabets.
3)=rand() BTW you don have to input the number value inside the parentheses,it will work as well.Methink it has to do with the fact that =RAND() is a Function in Excel used to generate number randomly.How it work in Ms Word,again I cant tell