A method of broadcasting a first beacon by an access point of a communications system includes obtaining transmission times for second beacons broadcast by nearby access points, and adjusting a transmission time for the first beacon in accordance with the transmission times for the second beacons to group the first beacon and the second beacons together within a single channel. The apparatus comprises a bag having a centerline and a pouring region formed on one side of the centerline. The shredding means comprise at least one stationary shear blade and at least one rotary shear blade, as well as drive means. The filtered servo signal is used by the servo controller to provide improved track following in a tape drive. Each bit line has a zigzag configuration and connects to a pair of adjacent sourcedrain regions in alternating manner along the bit line length. In another embodiment the method uses at least two different binding agents, each binding to different epitopes on the target molecule.