16 bit operating system that is a walk simulator ("spacer" in Polish means "walk"). It's joke operating system. WE ARE NOT RESPONSIBLE FOR ANY POTENTIAL DAMAGE CAUSED BY THIS OPERATING SYSTEM. KEEP IN MIND IT'S JOKE, DON'T INSTALL IT ON REAL MACHINE BEACUSE IT CAN CAUSE SERIOUS DAMAGE TO IT AND MAYBE EVEN MAKE IT USELESS (it may overwrite some disk sectors).