A window or door element, in particular a tilting or side-hung window, comprising a) a blind frame; b) a wing which is movable relative to the blind frame and is especially tiltable or rotatable and comprises a wing frame, and c) comprising an automatic drive, having a drive housing and a drive means, at least for opening and optionally closing the window, which in the closed state of the wing is arranged in a hidden manner in the movable wing frame, in the blind frame or between said elements, and which is provided with a releasable coupling device for coupling the drive to the blind and/or wing frame, wherein d) the coupling device is arranged in a fully hidden manner in the movable wing frame, in the fixed blind frame or between said elements, and characterized in that e) the coupling device is formed in such a way that it can be decoupled from a location outside of the blind or wing frame (1, 2) without damaging the blind frame or the wing frame, e1) i) for which purpose the coupling device is formed in such a way that it can be decoupled in the closed state through a gap between the blind frame and the wing frame without damaging the blind frame or the wing frame, ii) or for which purpose the coupling device comprises an actuator which is formed to automatically decouple the coupling device, f) wherein a sliding block of the drive engages in an interlocking manner in a groove of the blind or wing frame, and the sliding block is connected to the drive housing via the drive means, and g) wherein a coupling part of the coupling device which is formed in the manner of a carriage is provided in an interlocking manner in the sliding block, h) wherein further the two parts of sliding block and coupling part are coupled to each other in an interlocking manner with a component such as a securing bolt or releasably with a latching mechanism. a) a blind frame; b) a wing which is movable relative to the blind frame and is especially tiltable or rotatable and comprises a wing frame, and c) comprising an automatic drive, having a drive housing and a drive means, at least for opening and optionally closing the window, which in the closed state of the wing is arranged in a hidden manner in the movable wing frame, in the blind frame or between said elements, and which is provided with a releasable coupling device for coupling the drive to the blind and/or wing frame, wherein d) the coupling device is arranged in a fully hidden manner in the movable wing frame, in the fixed blind frame or between said elements, and characterized in that e) the coupling device is formed in such a way that it can be decoupled from a location outside of the blind or wing frame (1, 2) without damaging the blind frame or the wing frame, e1) i) for which purpose the coupling device is formed in such a way that it can be decoupled in the closed state through a gap between the blind frame and the wing frame without damaging the blind frame or the wing frame, ii) or for which purpose the coupling device comprises an actuator which is formed to automatically decouple the coupling device, e1) i) for which purpose the coupling device is formed in such a way that it can be decoupled in the closed state through a gap between the blind frame and the wing frame without damaging the blind frame or the wing frame, ii) or for which purpose the coupling device comprises an actuator which is formed to automatically decouple the coupling device, i) for which purpose the coupling device is formed in such a way that it can be decoupled in the closed state through a gap between the blind frame and the wing frame without damaging the blind frame or the wing frame, ii) or for which purpose the coupling device comprises an actuator which is formed to automatically decouple the coupling device, f) wherein a sliding block of the drive engages in an interlocking manner in a groove of the blind or wing frame, and the sliding block is connected to the drive housing via the drive means, and g) wherein a coupling part of the coupling device which is formed in the manner of a carriage is provided in an interlocking manner in the sliding block, h) wherein further the two parts of sliding block and coupling part are coupled to each other in an interlocking manner with a component such as a securing bolt or releasably with a latching mechanism.