Great story, thanks for sharing :)

There was a Windows for Workgroups computer lab at my high school. They had a DOS-based login, but accessing the DOS prompt from Windows was disabled. At one point, someone figured out that the login screen could be bypassed by pressing Ctrl+Break; the teacher found out and disabled that particular keystroke. But after hours of experimenting, I figured out that Alt+3 sends an ASCII character (0x3) that has the same effect. So we were back to playing games in the lab after hours -- they were often hidden in a folder named Alt+255 which looked like a space in DOS but was invisible to the File Manager in Windows. Good times :)