Techniques are described herein that may be used to invalidate all entries in a table. Preferably, only users which measure a Signal to Noise plus Interference Ratio over a pre-defined threshold for a transmission beam send reply messages. The cover plate has a cover plate opening into which one or more of the nozzles may extend. The platform may have a processor, a computer readable storage medium having computer readable program code configured to selectively control shaping of an object with the tool via at least one hidden object associated with a predetermined navigated surgical operation. According to the present invention, there are provided an antenna having a circularly polarizing function and a frequency equalizing function achieved by a grid structure having roughness and fineness around a feeding point and density which allows visible light to pass through, an RFID tag using the antenna, and an RFID system using the tag. The device further includes a metal layer which is provided on the first insulating layer; a second insulating layer which is provided on the metal layer; and a second semiconductor chip which is provided on the second insulating layer.