A removable memory device is inserted into a channel information source computer, such as computer connected to the Internet, and channel map information is downloaded to it. In one embodiment, a role attribute is defined for one or more entries in the directory server. The first stage may also include adjustment circuitry coupled to the differential pair and configured to adjust an amount of current dissipated by the differential buffer. One or more trench isolation structures are formed through the active device layer and through the second semiconductor layer so as to relax the second semiconductor layer below the active device layer and impart a second directional stress on the active device layer opposite the first directional stress. The hard mask is also used as an implant mask. The user equipment device receives broadcast system information, and measures a signal power.