  The discovery of four-quark states attracted a lot of attention from the
theoretical as well as the experimental side. To study their properties from
QCD we use a functional framework which combines (truncated) Dyson-Schwinger
and Bethe-Salpeter equations in Landau gauge. This approach allows us to
extract qualitative results for mass spectra, decay widths and wavefunctions of
candidates for bound as well as resonant four-quark states. Furthermore, we can
investigate the possible internal structure of such states. We report on recent
developments and results using this functional framework and give an overview
about the current status as well as future developments.
