  In the last decade, numerous Virtual Observatory organizations were
established. One of these is the German Astrophysical Virtual Observatory
(GAVO) that e.g. provides access to spectral energy distributions via the
service TheoSSA. In a pilot phase, these are based on the Tuebingen NLTE
Model-Atmosphere Package (TMAP) and suitable for hot, compact stars. We
demonstrate the power of TheoSSA in an application to the sdOB primary of AA
Doradus by comparison with a "classical" spectral analysis.
