Abstract: The present invention relates to a window structure comprising a frame capable of being secured to a window opening, and hinges and latches fitted in the frame. The frame is preferably made up of an aluminum profile having the same cross section all around the frame. A substantial part of the profile consists of the interior part which receives the pane and has the shape of an open tube. Both the hinge and the latch are fitted in the open tube, to which they attach rotatably without any furniture or other fastening means. Both the hinges and the latches can be simply pressed into the open tube and be removed from it without dismantling the window structure in any way. Owing to the symmetry of the window structure the left- or right-handedness of the window can be determined as late as at the installation stage.The invention also relates to a hinge and a latch functioning in an open-tube-shaped frame structure.