Sequence Diagram: participants at the top and bottom. How about in the middle?

+1 vote
asked Mar 9 in Question / help by junkw (220 points)
I have a vertically long diagram so when I scroll vertically to the middle of the diagram, I don't see the top and bottom participants line.

Is is possible to somewhat make the participants appear in the middle too? (in addition to top and middle)
commented Mar 10 by albert (2,720 points)
Can you give an example by means of some plantuml code or a n example at the plantuml web server http://www.plantuml.com/plantuml/uml/ ?
commented Mar 12 by junkw (220 points)
I just want to repeat the participant bar in the middle of the diagram
commented Mar 12 by junkw (220 points)

like this, the participants would be show in the middle (not just on top and bottom):

the ideal would be to add the participants anywhere by adding a code like "insert_participants"

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