* **The command line interface** of `systemd`, `systemctl`, `loginctl`, `journalctl`, and all other command line utilities installed in `$PATH` and documented in a man page. We will make sure that scripts invoking these commands will continue to work with future versions of systemd. Note however that the output generated by these commands is generally not included in the promise, unless it is documented in the man page. Example: the output of `systemctl status` is not stable, but that of `systemctl show` is, because the former is intended to be human readable and the latter computer readable, and this is documented in the man page.
-* **The protocol spoken on the socket referred to by `$NOTIFY_SOCKET`**, as documented in [sd_notify(3)](https://www.freedesktop.org/software/systemd/man/sd_notify.html).
+* **The protocol spoken on the socket referred to by `$NOTIFY_SOCKET`**, as documented in
+ [sd_notify(3)](https://www.freedesktop.org/software/systemd/man/sd_notify.html). Note that, although using
+ libsystemd is a good choice, this protocol can also be reimplemented without external dependencies, as
+ demonstrated in the example listed in
+ [systemd.service(5)](https://www.freedesktop.org/software/systemd/man/systemd.service.html)
* Some of the **"special" unit names** and their semantics. To be precise the ones that are necessary for normal services, and not those required only for early boot and late shutdown, with very few exceptions. To list them here: `basic.target`, `shutdown.target`, `sockets.target`, `network.target`, `getty.target`, `graphical.target`, `multi-user.target`, `rescue.target`, `emergency.target`, `poweroff.target`, `reboot.target`, `halt.target`, `runlevel[1-5].target`.
| [hostnamed](https://www.freedesktop.org/software/systemd/man/org.freedesktop.hostname1.html) | D-Bus | yes | yes | GNOME | yes | [Ubuntu](https://launchpad.net/ubuntu/+source/ubuntu-system-service), [Gentoo](http://www.gentoo.org/proj/en/desktop/gnome/openrc-settingsd.xml), [BSD](http://uglyman.kremlin.cc/gitweb/gitweb.cgi?p=systembsd.git;a=summary) | partially |
| [localed](https://www.freedesktop.org/software/systemd/man/org.freedesktop.locale1.html) | D-Bus | yes | yes | GNOME | yes | [Ubuntu](https://launchpad.net/ubuntu/+source/ubuntu-system-service), [Gentoo](http://www.gentoo.org/proj/en/desktop/gnome/openrc-settingsd.xml), [BSD](http://uglyman.kremlin.cc/gitweb/gitweb.cgi?p=systembsd.git;a=summary) | partially |
| [timedated](https://www.freedesktop.org/software/systemd/man/org.freedesktop.timedate1.html) | D-Bus | yes | yes | GNOME | yes | [Gentoo](http://www.gentoo.org/proj/en/desktop/gnome/openrc-settingsd.xml), [BSD](http://uglyman.kremlin.cc/gitweb/gitweb.cgi?p=systembsd.git;a=summary) | partially |
-| [initrd interface](INITRD_INTERFACE.md) | Environment, flag files | yes | yes | mkosi, dracut, ArchLinux | yes | ArchLinux | no |
-| [Container interface](CONTAINER_INTERFACE.md) | Environment, Mounts | yes | yes | libvirt/LXC | yes | - | no |
-| [Boot Loader interface](BOOT_LOADER_INTERFACE.md) | EFI variables | yes | yes | gummiboot | yes | - | no |
+| [initrd interface](INITRD_INTERFACE) | Environment, flag files | yes | yes | mkosi, dracut, ArchLinux | yes | ArchLinux | no |
+| [Container interface](CONTAINER_INTERFACE) | Environment, Mounts | yes | yes | libvirt/LXC | yes | - | no |
+| [Boot Loader interface](BOOT_LOADER_INTERFACE) | EFI variables | yes | yes | gummiboot | yes | - | no |
| [Service bus API](https://www.freedesktop.org/software/systemd/man/org.freedesktop.systemd1.html) | D-Bus | yes | yes | system-config-services | no | - | no |
| [logind](https://www.freedesktop.org/software/systemd/man/org.freedesktop.login1.html) | D-Bus | yes | yes | GNOME | no | - | no |
| [sd-bus.h API](https://www.freedesktop.org/software/systemd/man/sd-bus.html) | C Library | yes | yes | - | maybe | - | maybe |
| [$XDG_RUNTIME_DIR](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html) | Environment | yes | yes | glib, GNOME | yes | - | no |
| [$LISTEN_FDS $LISTEN_PID FD Passing](https://www.freedesktop.org/software/systemd/man/sd_listen_fds.html) | Environment | yes | yes | numerous (via sd-daemon.h) | yes | - | no |
| [$NOTIFY_SOCKET Daemon Notifications](https://www.freedesktop.org/software/systemd/man/sd_notify.html) | Environment | yes | yes | a few, including udev | yes | - | no |
-| [argv[0][0]='@' Logic](ROOT_STORAGE_DAEMONS.md) | `/proc` marking | yes | yes | mdadm | yes | - | no |
+| [argv[0][0]='@' Logic](ROOT_STORAGE_DAEMONS) | `/proc` marking | yes | yes | mdadm | yes | - | no |
| [Unit file format](https://www.freedesktop.org/software/systemd/man/systemd.unit.html) | File format | yes | yes | numerous | no | - | no |
| [Network](https://www.freedesktop.org/software/systemd/man/systemd.network.html) & [Netdev file format](https://www.freedesktop.org/software/systemd/man/systemd.netdev.html) | File format | yes | yes | no | no | - | no |
| [Link file format](https://www.freedesktop.org/software/systemd/man/systemd.link.html) | File format | yes | yes | no | no | - | no |
-| [Journal File Format](JOURNAL_FILE_FORMAT.md) | File format | yes | yes | - | maybe | - | no |
+| [Journal File Format](JOURNAL_FILE_FORMAT) | File format | yes | yes | - | maybe | - | no |
| [Journal Export Format](JOURNAL_EXPORT_FORMATS.md#journal-export-format) | File format | yes | yes | - | yes | - | no |
| [Journal JSON Format](JOURNAL_EXPORT_FORMATS.md#journal-json-format) | File format | yes | yes | - | yes | - | no |
| [Cooperation in cgroup tree](https://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups) | Treaty | yes | yes | libvirt | yes | libvirt | no |
-| [Password Agents](PASSWORD_AGENTS.md) | Socket+Files | yes | yes | - | yes | - | no |
+| [Password Agents](PASSWORD_AGENTS) | Socket+Files | yes | yes | - | yes | - | no |
| [udev multi-seat properties](https://www.freedesktop.org/software/systemd/man/sd-login.html) | udev Property | yes | yes | X11, gdm | no | - | no |
| udev session switch ACL properties | udev Property | no | no | - | no | - | no |
| [CLI of systemctl,...](https://www.freedesktop.org/software/systemd/man/systemctl.html) | CLI | yes | yes | numerous | no | - | no |
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