Editing spots and links in the BDV views.

See also the ‘Linking spots’ and ‘Manually adding spots and linking them’ sections in this tutorial.

Action	Key
Adding, deleting and modifying spots.
Add a new spot.	Put the mouse at the desired position and press the A key.
Move a spot.	Put the mouse inside a spot, press and hold space, and move the mouse to the desired position.
Delete a spot.	Put the mouse inside a spot and press D.
Change the radius of a spot.	Put the mouse inside a spot and press Q (make it smaller) or E (bigger). Hold Shift to make larger changes or Control for finer changes.
Adding and linking spots.
Link one spot to an existing one in the next frame.	Put the mouse inside a source spot, and press and hold L. The viewer moves to the next time-point and shows a preview of the link. Release the L key in the desired target spot. A link is created from the source spot to the target spot.
Link one spot to an existing one in the previous frame.	Same procedure, but press Shift L.
Add and link to a spot in the next frame.	Put the mouse inside a source spot, and press and hold A. The viewer moves to the next time-point, creates a spot there and links it to the source spot While holding A, move the new spot to the desired location, and release A.
Add and link to a spot in the previous frame.	Same procedure, but press Shift A.
Toggle the auto-linking mode.	Control L
Removing links.
Delete a link.	Put the mouse over the link to delete and press D.
Selection editing.
Add a spot / link to the selection.	Shift click on a spot or a link to add / remove it to / from the selection.
Clearing the selection.	Click on an empty place of the image.
Remove selection content.	Shift delete
Undo / Redo.
Undo / Redo	Control Z / Control Shift Z