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Hot stars emit large amounts of X-rays, which are assumed to originate in thesupersonic stellar wind. Part of the emitted X-rays is subsequently absorbed inthe wind and influences its ionization state. Because hot star winds are drivenradiatively, the modified ionization equilibrium affects the radiative force.We review the recent progress in modelling the influence of X-rays on theradiative equilibrium and on the radiative force. We focus particularly onsingle stars with X-rays produced in wind shocks and on binaries with massivecomponents, which belong to the most luminous objects in X-rays.

Influence of X-ray radiation on the hot star wind ionization state and on the radiative force