The Management screen is split into two frames: on the left is a
Tree view of the Transmitters (TX) and the connected Receivers
(RX); on the right is a two-tab view, one is a List view of the RX,
and the other is a Matrix view of TX and RX; the former lists all of
RX but no TX, and the latter displays a matrix table in a coordinate
style: the horizontal axis is a list of RX and the vertical axis is of TX.
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