This command shows or hides the Selection Start/End window.
The Selection Start/End window displays the position values and/or
length of the current selection.
If there is no selection, it displays the current cursor position value
by showing the same number in both Start and End boxes and
0 value in the Length box.
You can change the selection by entering new values in Selection
Start/End window. The change made in this window will be reflected
to the selection of the waveform data.

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