Query, History, and Answerset windows can be displayed as tabbed windows instead of the usual Tiled, Cascaded, or Maximized options. When tabbed, the windows can be split into two tab groups to allow the easy comparison of the contents of each window.
The open windows arrange in tabs.
After the window is tabbed, a second tab group can be opened either by right-clicking on a tab and using the menu, or by dragging the tab to any edge of the window. (Dragging to a side opens side by side tab groups, while dragging to the top/bottom opens one tab group above the other.)
A tabbed window can also be dragged to a new location within its own tab group, or to another tab group.