I looked up RM Tutor, and it most definitely has a client side. This must be installed on the client machines in order for the teacher to control the other machines.
RM Tutor 4 User Guide[
^] (Look at the installation section under "Client or Student"
The problem here is that systems are designed specifically to prevent you from doing this. Unless you have some kind of access rights to the machines (you have the Admin credentials) or you install some kind of client software on them, they won't respond to your requests. Can you imagine what kind of security hole it would be if all you had was an IP address and you could install files on a target machine?
If you want to do this, you will need admin rights on the target machines or be able to install a piece of software on the client machines that allows you to transfer files.