Abstract: A binding comprising a base plate (1) carrying, for holding a boot, front retention (2) and a heelpiece (7) mounted slidably on the base plate, and a traction strap (16) acting on the heelpiece in order to pull it forward. The base plate (1) is equipped with a rack (6), and the heelpiece (7) is equipped with two levers (11, 12), the lower arms of which are connected to the ends of a small arch (15) which hooks into the rack. The upper arms of the levers are connected to the traction strap (16) which is intended to pass diagonally over the instep of the boot. The pressure on the small arch makes it possible to increase the force of the forward thrust and the heel of the boot is pressed against the base plate.

Abstract: A system for control of access by messages to computer machines which are connected in a host private network by at least one private terminal that comprises an access control module interconnected at each input-output point of the host private network, each module allowing the selective transmission by inhibition, free or conditional authorization of the transmission of the messages to the host private network. A centralized supervisor module is associated with the host private network and interconnected by a specialized link to each access control module, allowing thus to control the selective transmission of the messages by each access control module.