We start this week with a webserver with extras in a single file that runs on any x86-64 operation system. Enter redbean 2.0. Created by Justine Tunney, it uses the "Actually Portable Executable" that you can read about here, justine.lol/ape.html. When you compile a program to its native binary, in this case x86-64 code, and don't call any external code, then the only difference between a Windows and a Linux would be the file format. If you can solve this, then it could run on any platform. To do that you need Cosmopoliton libc because any real program needs to make some calls, in this case the standard C ones. So, with Cosmo and the APE format, you can write a C program and compile it to a single file that will load and run on six very different operating systems and the same binary can also be booted directly from the PC BIOS. It's not perfect, but any programmer would be scratching their heads by now. Pause for techie amazement.