Ulrich Drepper, of glibc fame, decided to tell us about how easy it was to set up a dual wide screen configuration on his machine. After going on about how dual head is so much easier to set up than it was before now that you don't have to sacrifice your first born, he gets to the secret of his configuration:
These lines in the Device section announce the two screens. It is unfortunately not well (at all?) documented that the first parameter strings are magic. [...] Add to the names DVI-0 and DVI-1 the magic prefix "monitor-" and add as the second parameter string an arbitrary identifier. Do not drop or change the "monitor-" prefix, that's the main magic which seems to make all this work.
Dude, he's calling it magic. Ulrich Drepper is calling it nonsensical arbitrary bullshit. Setting up dual-head on Linux is non-obvious to a guy hacks on the core system library. But surely, Linux is ready for your grandma.