Video and Audio Conferencing
This allows both parties to see and talk to each other; in the case of this collaboration, it allows the class (4.182) to present their projects to the architects at Fosters and Partners in London and gain valuable and immediate feedback and comments.

Whiteboard
The whiteboard allows both parties to relay graphic information in realtime.

Chat
Chat allows each participant to ask and answer questions in realtime.

File Transfer
As implied by its name, file transfer allows either party to transfer one or many files to the other party. This is a fairly useful utility when two parties who are working on a single file in remote collaboration.