Roger wrote to uk.transport.london on Sun, 28 Nov 2004:

1995, 1996 and, I assume, 1992 - I think that's all.
Will only re-open (all) the doors on the car(s) that have been detected as
having doors not closed.

I must admit that I rarely use this as it is just as simple to re-open all
the doors. However it is useful at rush hours and at stations where there
is a continuous stream of people onto the train.

From a passenger's point of view, it's jolly useful when you *do*
re-open all the doors, if one is just missing a train.... still, there's
usually another one along very shortly.
--
"Mrs Redboots"
http://www.amsmyth.demon.co.uk/
Website updated 28 November 2004