On 06/01/2012 10:57, Paul Rigg wrote:
I think his point was, and I think he is right, that the DDR authorities
allowed anyone to cross the wall who was either not one of their own
nationals or a national of another country (ie the Eastern Block) with
whom they had an agreement to stop travel.

The West German authorities did not check entries to West Berlin from
East Berlin, presumably because of the four powers agreement which said
that West Berlin was made up of British, American and French Sectors.

So, there was literally no border control on the West Berlin side when
crossing from East Berlin? Nobody even checking passports?

What about at the Inner German Border?