Recently, after the first detection of High Velocity Clouds (HVCs) by
 Muller et al. (1963), it was anticipated that they interact with the
 galactic halo or the disk itself. This suggestion was based only on
 morphological arguments, derived from HI 21 cm line studies, but direct
 observational evidence for an interaction scenario was not found. The
 ROSAT mission (Truemper 1983) give us the opportunity to study the
 large scale distribution of galactic atomic hydrogen in soft X-ray
 absorption (Snowden et al. 1991, Kerp 1994). Additionally, in the case
 of HVC 90+42.5-130, we detect for the first time soft X-ray emission
 associated with a high-velocity-cloud (Kerp et al. 1994a). Kerp et al.
 (1994a) claimed that magnetic reconnection (Lesch 1991, Kahn and Brett
 1993) is the heating process of the HVC boundaries. This suggestion is
 strongly emphasized by the detection of a strong magnetic field
 (larger than 20 my Gauss, Kerp and Guesten, in prep.) by HI 21-cm Zee-
 man observations with the Effelsberg telescope. Thus, based on the
 X-ray and HI 21-cm line data, we found evidence that the soft X-ray
 emission is physically associated with the HVC. Furthermore, magnetic
 reconnection can easily account for the detected energies, and is most
 probably the main heating process in these high temperature, low vol-
 ume density areas (Kerp et al. 1994b). Thus, apart from the very hot
 HVC boundaries, we expect cooling lines, especially via the CII and OI
 finestructure transitions. Moreover, the interaction zone of HVC with
 the galactic disk matter is an area of small scale density variations,
 with enhanced cooling and grain formation. Quite close to the area of
 the brightest soft X-ray emission, IRAS detected at 100 microns and 60
 microns infrared emission. Due to the close positional correlation
 with the X-ray emission we expect colour gradients in the ISO bands.
 Also the line ratio of CII(158my) and OI(63my) will reveal appreciable
 variations over this IRAS cloud. An indication for the contribution of
 OI(63my) to the I(60) band is indicate by the high I(60)/I(100) ratio.