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Several Active Galactic Nuclei (AGNs) have been reported to harbor fast outflows exceeding 10,000 km s, which are detected mostly in their low-resolution CCD X-ray spectra. Only few, however, were detected with high-resolution grating spectrometers. Most of the grating detected outflows have been observed multiple times. In these cases, the absorption spectrum changes are indicating that variability is common among these high-velocity winds. In this paper we revisit the grating observations of PG 1211+143, and PDS 456, and report preliminary results on 4C 74.26. We discuss the spectral variability of the first two sources and its implications to the outflows. [ABSTRACT FROM AUTHOR]

In this paper I review the recent progress in understanding the physics of the gas outflowing from active galactic nuclei and its impact on the surrounding environment, using the combined information provided by multiwavelength Ultraviolet-X-ray campaigns. [ABSTRACT FROM AUTHOR]