As it happens, tekknolagi and I have actually been trying to read StoneKnifeForth for a couple of weeks (though it's been slow going because I became a father in that time). That quickly got us into learning about ELF, because the binaries generated by StoneKnifeForth only seem to run as `sudo` for some reason. As a regular user they die with SIGKILL while being loaded.

The link to the ELF visualization (http://i.imgur.com/xMyblyM.png) at https://bootstrapping.miraheze.org/wiki/Main_Page is very useful. Thanks!