A client station in a wireless local area network communication system includes a beam commutation algorithm and a smart antenna responsive to the beam commutation algorithm for selecting one of a plurality of directional antenna beams. User image files are analyzed to obtain semantic information about the content of the plurality of image files. Furthermore, an electromagnetic shielding capacity can be obtained without enlarging the optical connector by making the shutter unit from electrically conducting members. The method also includes inserting the fastener in the body with the tapered end of the conical shaped portion leading the first end, heating the polymeric material of the fastener in the body, and applying pressure to the polymeric material of the fastener while heating to cause the polymeric material to flow in the body. A method for capturing and analyzing test data in accordance with an embodiment includes: capturing multi-bit integer values of test data; writing each multi-bit integer value to a multi-bit vertical field in an image file; extracting the multi-bit integer values from the multi-bit vertical fields in the image file; and analyzing the extracted multi-bit integer values.