the other hand absolute accuracy and high strength of the abutment faces for the windows are provided the latter characteristics are of particular significance for the application of adhesively bonded windows in passenger vehicles since it is for precisely this reason that the windows are bonded to the tubular metal frame in order to use them as structural components for increasing the strength of the vehicle side wall l shaped hollow sections and t shaped hollow sections are particularly preferred for the side beams and longitudinal members with the latter cross section forming a window bead by each angular space between the web and flange therefore the t shaped hollow sections should be used preferably for frame components serving for the attachment of adjacent windows either located alongside or above each other in a further preferred embodiment of the present invention the side beams and or the longitudinal members may also be square tubes with an integrally formed bead protruding from one tube wall toward the window opening it is particularly advantageous to use such hollow sections with protruding bead s for the longitudinal members and to use l or t shaped hollow sections for the side beams since the side beams may be slotted deep enough at their lower and upper ends so that they may be fitted over the protruding beads on the upper and lower longitudinal members and be seated fully on the tube wall forming the bead this will.