This did not work.
The alarm went off every ten minutes. When the mailman came by. When a parent dropped in. When the grounds-people went to work fixing up the basketball court. When a student showed up wearing new shoes.
So now it just tries to keep track of who's where and when. If someone leaves by the school-gates during classes, their gait is checked to see if it kinda-sorta matches any student gait and if it does, whoop-whoop-whoop, ring the alarm!
Chavez High is ringed with gravel walkways. I like to keep a couple handsful of rocks in my shoulder-bag, just in case. I silently passed Darryl ten or fifteen pointy little bastards and we both loaded our shoes.
Class was about to finish up -- and I realized that I still hadn't checked the Harajuku Fun Madness site to see where the next clue was! I'd been a little hyper-focused on the escape, and hadn't bothered to figure out where we were escaping to.
I turned to my SchoolBook and hit the keyboard. The web-browser we used was supplied with the machine. It was a locked-down spyware version of Internet Explorer, Microsoft's crashware turd that no one under the age of 40 used voluntarily.
I had a copy of Firefox on the USB drive built into my watch, but that wasn't enough -- the SchoolBook ran Windows Vista4Schools, an antique operating system designed to give school administrators the illusion that they controlled the programs their students could run.
But Vista4Schools is its own worst enemy. There are a lot of programs that Vista4Schools doesn't want you to be able to shut down -- keyloggers, censorware -- and these programs run in a special mode that makes them invisible to the system. You can't quit them because you can't even see they're there.
Any program whose name starts with $SYS$ is invisible to the operating system. it doesn't show up on listings of the hard drive, nor in the process monitor. So my copy of Firefox was called $SYS$Firefox -- and as I launched it, it became invisible to Windows, and so invisible to the network's snoopware.
Now I had an indie browser running, I needed an indie network connection. The school's network logged every click in and out of the system, which was bad news if you were planning on surfing over to the Harajuku Fun Madness site for some extra-curricular fun.