dbus-user-session - 1.12.28-0+deb11u1 main

D-Bus is a message bus, used for sending messages between applications.
Conceptually, it fits somewhere in between raw sockets and CORBA in
terms of complexity.
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On systemd systems, this package opts in to the session model in which
a user's session starts the first time they log in, and does not end
until all their login sessions have ended. This model merges all
parallel non-graphical login sessions (text mode, ssh, cron, etc.), and up
to one graphical session, into a single "user-session" or "super-session"
within which all background D-Bus services are shared.
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Multiple graphical sessions per user are not currently supported in this
mode; as a result, it is particularly suitable for gdm, which responds to
requests to open a parallel graphical session by switching to the existing
graphical session and unlocking it.
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To retain dbus' traditional session semantics, in which login sessions
are artificially isolated from each other, remove this package and install
dbus-x11 instead.
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See the dbus package description for more information about D-Bus in general.