Sony DCR-TRV39 - Manual (Page 155)

Bring to back
Moves the selected object to the back of all the overlapping
objects.
Aligning objects
Click the [Alignment] button to align the selected objects in relation to
one another. A dropdown menu is displayed. Select the objects' new
alignment.
In Windows, the object defined by the blue control points will be the
reference object of all selected objects.
In Macintosh, the object placed farthest away in the desired direction of
alignment will be the reference.
Align left
Align the left side of all selected objects according to the control
points on the left side of the reference object.
Align right
Align the right side of all selected objects according to the control
points on the right side of the reference object.
Align top
Align the top of all selected objects according to the control points
on the top of the reference object.