Tordanik
(Tobias Knerr)
6
The link provided by efred is a “Permalink”. It links to a coordinate.
From your posts I assume that you want to link to an object. That’s possible by using the object’s id in the OSM database, like this:
http://www.openstreetmap.org/browse/way/30089216
30089216, in this case, is the building outline’s id.
That’s what, for example, the people at flickr are using for their OSM links. However, this method is somewhat fragile, as the object id might change due to certain edits (such as splitting a way, deleting and recreating an object, or replacing a node with an area). Unfortunately, there’s no better method at the moment.