hooks 22 shown in fig5 and 6 positioned on opposing sides of the keyboard tray coupling end 16 and projecting therefrom so that one leg of the l shape projects at a substantially right angle from the tray coupling end 16 and so that the second leg of the l shape projects at a substantially right angle from the first leg so as to be substantially parallel to the surface of the tray coupling end 16 the hooks 22 are dimensioned to mate with a corresponding plurality of slots 24 located in a center portion of the bottom surface of the keyboard tray 20 with the second leg of each l shaped hook 22 passing through a corresponding slot 24 and with the tray 20 then being moved rearward until the first leg of each l shaped hook 22 contacts the forward end of the corresponding slot 24 in this configuration a portion of the second leg of each l shaped hook 22 has now passed beyond the forward end of the corresponding slot 24 preventing the keyboard tray 20 from being lifted off of the tray coupling end 16 in the preferred embodiment a first side of the keyboard tray coupling end.