Speech and gesture multimodal control of a whole earth 3D vir-tual environment

Profiled interfitting pairs of frames of plastic material, such as sash frames and window wings, door frames and doors, or the like, which are provided with interengaging sealing surfaces separating the pair of frames from each other, are cast in a single working step in a common mold which is subdivided into two mold cavities for the pair of frames by mounting a separating member within the mold having complementarily shaped side surfaces defining snugly interengaging sealing surfaces of the completed pair of frames.