<listitem><para>The
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry> library
exposes the
- <citerefentry><refentrytitle>sd_bus_open_system_container</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>sd_bus_open_system_machine</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call to connect to the system bus of any registered container.</para></listitem>
<listitem><para>The
<citerefentry><refentrytitle>systemd-importd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
is also available, which implements importing, exporting, and downloading of container and VM images.
</para>
+
+ <para>For each container registered with <filename>systemd-machined.service</filename> that employs user
+ namespacing, users/groups are synthesized for the used UIDs/GIDs. These are made available to the system
+ using the <ulink url="https://systemd.io/USER_GROUP_API">User/Group Record Lookup API via
+ Varlink</ulink>, and thus may be resolved with
+ <citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> or the
+ usual glibc NSS calls.</para>
</refsect1>
<refsect1>