  HD 181068 is the only compact, triply eclipsing, hierarchical triple system
containing a giant star known to date. With its central, highly-active G-type
giant orbited by a close pair of main-sequence dwarfs, the system is ideal to
study tidal interactions. We carried out a multiwavelength study to
characterize the magnetic activity of the HD 181068 system. To this end, we
obtained in- and out-of-eclipse X-ray snapshots with XMM-Newton and an optical
spectrum, which we analyzed along with the Kepler light-curve. The primary
giant shows strong quiescent X-ray emission at a level of 2e31 ergs, an S-index
of 0.41 +/- 0.01, and marked white-light flares releasing up to 6e38 erg in the
Kepler-band. During the second X-ray observation, we found a three-times
elevated -- yet decaying -- level of X-ray emission, which might be due to an
X-ray flare. The high level of magnetic activity is compatible with the
previously reported absence of solar-like oscillations in the giant, whose
atmosphere, however, undergoes tidally-induced oscillations imposed by the
changing configuration of the dwarf-binary. We found that the driving force
exciting these oscillations is comparable to the disturbances produced by a
typical hot Jupiter, making the system a potential test bed to study the
effects of tidal interactions also present in planetary systems.
