What is ~/.config/autostart/dbus-session-addr-save.sh good for?

My ~/.config/autostart/ contains the following two files:

dbus-session-addr-save.desktop:

[Desktop Entry]
Type=Application
Name=umf
Exec=/home/<my-useame>/.config/autostart/dbus-session-addr-save.sh
Icon=system-run
Comment=

dbus-session-addr-save.sh:

echo ${DBUS_SESSION_BUS_ADDRESS} > /tmp/.umf_<my-useame>

So the desktop file seems to launch the script and the script writes dbus information into a world-readable file. Can somebody explain what this is good for? Is it safe to have them? ${DBUS_SESSION_BUS_ADDRESS} and /tmp/.umf_<my-useame> contain a cryptic string like unix:abstract=/tmp/dbus-...,guid=... where the dots represent random strings.

I'm on Ubuntu 14.04.4 LTS

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