  We discuss the crucial role of a dynamical picture in the analysis of AGN
intrinsic absorbers data. High quality FUSE data of Mrk 279 are used to
demonstrate that the line of sight covering fraction is a strong function of
velocity. In Mrk 279, as well as in most cases where the data is of high enough
quality, the shape of the absorption troughs is mainly determined by the
velocity-dependent covering fraction. We argue that the traditional ``cloud''
picture of AGN outflows is hard pressed to account for the velocity-dependent
covering fraction, as well as for the highly super-thermal width of the troughs
and the detached trough phenomenon. A disk outflow picture naturally explains
these features and furthermore, is using the simplest reservoir for the
outflowing material: The accretion disk around the black hole. Accounting for
velocity dependent covering can drastically increase the inferred ionic column
density of the analyzed trough, an increase which is amplified in the total
column density and ionization parameter solution for the AGN outflow trough.
