Window that can both slide open and pivot open

A window comprising a frame including a head and a sill, each comprising a channel, the window further comprising at least first and second casements, wherein the first casement includes a hinge for rotating the first casement relative to the frame, the hinge being movable relative to the frame along the sill channel such that the first casement is slidable within the frame, the first casement also including an upper surface and a lower surface, and at least one guide located on the upper and/or lower surface of the first casement distal from the hinge and movable within the respective head or sill channel as the first casement slides relative to the frame, the at least one guide disengagable from the respective head or sill channel allowing the at least one guide to pass out of the respective channel thus allowing the first casement to be opened relative to the frame, the sill including a runner on which the casement is slidable, wherein the frame includes a landing strip at a location where the hinge of the first casement is positioned for rotatable opening, the landing strip including a surface to spread the weight of the first casement across the frame, and wherein the hinge comprises a first part having a quadrant shape and a second part having a rectilinear portion, wherein the first and second parts are pivoted to one another and the first part is arrangeable on the lower surface of the first casement and the second part is movable along the sill channel, and wherein the landing strip comprises a sidewall to reduce the width of the sill channel such that it is approximately equal to the width of the second part.