[Kirble]

In order to have access to the Graal executable file, it needs to connect via whichever port it runs on (as i'm sure you know). Now, unless you either have access to cmd.exe or access to the settings of the firewall, it's pretty much hopeless. I mean you could open up a notepad and type command.com and save it as a .bat file (At least I think that's how you do it) then save it to your login and open it up, hopefully, if I have remembered that rightly, it could open up cmd.exe, depending on your school administrator's security levels.

Hope I helped somewhat.