Harry, Ron, and Hermione walked into the shabby cafe on Tottenham Court Road, and sat down in one of the booths.
"So, now we need to work on a plan to find all the Horcruxes," Harry said.
"Perhaps we could try using a computer," Hermione said.
"What's a computer?" Ron asked.
"It's a muggle device used for all sorts of things. Personally, Linux is my favorite-"
There was a loud crack as Richard Stallman appeared in the booth next to them.
"I'd just like to interject for a moment," Richard Stallman said. "What you're referring to as Linux, is in fact, GNU/Linux, or as I've recently taken to calling it, GNU plus Linux. Linux is not an operating system unto itself, but rather another free component of a fully functioning GNU system made useful by the GNU corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.
Many computer users run a modified version of the GNU system every day, without realizing it. Through a peculiar turn of events, the version of GNU which is widely used today is often called "Linux", and many of its users are not aware that it is basically the GNU system, developed by the GNU Project. There really is a Linux, and these people are using it, but it is just a part of the system they use.
Linux is the kernel: the program in the system that allocates the machine's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. Linux is normally used in combination with the GNU operating system: the whole system is basically GNU with Linux added, or GNU/Linux. All the so-called "Linux" distributions are really distributions of GNU/Linux."
"But how-" Harry spluttered.
"Talking about Linux as an operating system is Taboo," Richard Stallman said.
And with another loud crack, he was gone.