The system allows the installation of over-curtains with partial or total overlap and of under-curtains, also with partial or total overlap. The 405 system gives the possibility of fitting the pelmets and the vertical blinds fixed with velcro© on a special front section. Independent cord operation for under-curtains and over-curtains (or by hand). For use with curtains 700 cm w max. and 300 cm h, weighing not more than 6 kg for each curtain pair. The fabric opening can be central and lateral or asymmetric and multiple. Ceiling or wall installation with overhanging brackets. The operating cords run in independent side-by-side channels. Sliding is guaranteed by self-lubricating polyethylene slides or by acetylic gliders for curtains at the load limit.