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.