The work area
is defined by the position of the marker [B],
which you can drag by the tips as well as by the middle grip. In the first
case, the beginning or the end of the work area is positioned. In the
second case, they change synchronously in such way that the length of
the work area is unchanged.
Pressing the B key (menu ) defines the current frame as the beginning, and the
N key (menu ) as the end of the work area.
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