Beyond the architecture, engineering and construction industry, the legal profession was another field which took to ‘extranets’ in a big way. A Legal Technology News article suggests that the term may have morphed: into "client workspaces".
The term may have evolved in the legal world, but I can’t see us shifting towards such a term in the AEC sector. While the ultimate client remains a key member of the project team, some clients adopt something of a hands-off approach to the schemes they commission, briefing the team and then letting the professionals get on with the detailed work. Moreover, collaboration takes place between a much wider group of businesses than would be found in most client/law firm relationships, with many sub-contractors, sub-consultants and consultants having only an indirect contractual relationship.