Comment # 5 on bug 1180493 from S������awomir Lach

You misunderstood me. Flatpak have two installations, by default (user and
system), but allow to add new. I asks to allow (using Yast2) to add one new
installation. Imagine we mount flatpak partition on /var/flatpak-multios and
add entry to special configuration file (I will search, where it's placed) for
this new installation. I do this configuration on some small distro and
OpenSUSE. Next I installed my shop client on this installation and can use
single shop installation on both systems.
Idea is to add /var/flatpak-multios (or whatever) to flatpak configuration file
and ask (during system installation/configuration, which partition mount to
this mount point).
So idea is basically to add new installation (in flatpak dictionary: place
where to put flatpak binaries/metadata/repodata/etc.).