A method, system and apparatus are provided for performing peer-to-peer data sharing operations between user equipment devices in a wireless-enabled communications environment. When the user holds the mobile computing device with both hands at the bottom or side edges, hisher fingers are free to press the rearward-facing keys of the attached keyboard. The fluid and the diffuser particles may be moved, for example perpendicularly to the beam of radiation, or perpendicularly to a scanning direction of the beam of radiation in a scanning lithographic apparatus, in order to improve the diffusion action. The complexity of the shimming system is removed from the coils and transferred to the current controlling electronics. The brush plate is covered in its cross section by a pivotable cover. Such updating can be further iterated, for additional demodulation parameter refinement.