The borders of unread documents are colored red, the borders of writable documents made thicker and open documents are offset to the side to indicate they are being edited. Incoming documents slide in from the left side to alert the user, and newly created documents pop down from the top and push the stream backwards by one document into the past. In this way documents are eventually moved out of view and archived automatically. New and clone create documents. New creates an empty document and adds it to your stream.
Clone duplicates an existing document.
Transfer copies a document from your stream to someone else's. Find prompts the user for a search query and creates a substream . Two substreams may overlap. Moreover, substreams can be created and destroyed on the fly without affecting the organization provided by the stream or any existing substream. Substreams are dynamic.