Aperture Work with two Browsers open
You can work with two items in the Library inspector open at once, splitting the Browser into a separate pane for each item.
Split the Browser into two panes
Select one item in the Library inspector, and Option-click a second item in the Library inspector.
The Browser splits into two panes and shows thumbnail images for both items.
You can also set different display options for each pane. For example, one pane may show photos in grid view and the other in list view. You may find that working with multiple Browser panes open allows you to easily copy or transfer the contents of one item in the Library inspector to another. You can also open multiple items in the Library inspector and display their contents in a single Browser. For more information about opening and closing multiple projects, seeOpen and close items in the Library inspector.