I always find loops holes to let me do stupid little things like changing hte backround and such. I had/have? (dont know anymore) a way to change user privledges, etc.... I was able to change the files that disallowed people to use certain programs or change backround.
Also, if your school computer blocks floppy disks, next time you goto open something, type F:/ (if F is your floppy drive) in the text box, then press enter.
I can also search through alll their windows files and all the shit that they hide.