I would have questions to those who saw the play, either this representation or an other one;
first, how was represented the suicide, the death, of the main caracter?
And the other is more about the last lines, or should I say, the last one "open the curtains"; how were they used? [sorry for the grammar part of this question...]
In the death scene of the current production the actress simply delivers the lines, in a serene peaceful tone, at slow intervals. At a London performance in 2006 there was a noose with a chair beneath it on stage during the final scene, but nobody occupied them; the actors gathered in a corner reciting the lines in chorus, and the death was represented by the chair falling over (done with invisible wires).
In every production I've seen one or several actors on the stage simply say 'please open the curtains'. In the original London run this was followed by black curtains, that had covered all the theatre windows throughout, being removed; in 2006 and the current run it is followed by blackout.