In an era long gone, on systems without a GUI/copy+paste/etc there were all sorts of silly tricks, lots involving ASCII codes. One thing was naming a directory with one or more " "s. That's not a space character but ASCII code 255 (hold alt, press 255 on your numpad). The directory would (and does - this still works on modern OSs) appear as a blank. And so how does one access a directory with no name? Obviously these things were really easy to get by, but in an era before the internet such little tricks had a really long shelf life.