Multiple instances of Revu can be opened at the same time. Click the Bluebeam Revu icon on the Desktop or the Start menu to open another instance of Revu.
The ability to open multiple instances of Revu can be disabled in the General Preferences. When this option is disabled, attempting to open another instance of Revu will bring the current instance to the front.
In addition to independently viewing and working on documents within multiple instances of Revu, pages from a document in one instance can be easily moved to a document open in the other by dragging and dropping the thumbnail.