Disclosed herein is a laptop-size high-order harmonic generation apparatus using near field enhancement. If the number of unused carriers in a local pool falls below a predetermined level, additional carriers are allocated from a regional pool in the network channel management station NCMS. The invention also relates to novel intermediates used in this process and their use in the preparation of compounds of formula. The method may also require that no visual feature is occluded. When the clamp plate is inserted through the fitting hole and moved in one direction along a lower surface of the chassis, the lockingunlocking piece engages with an edge of the fitting hole opposite the direction of movement.