The Tile, Cascade, and Arrange Icons menu items work the same way as in other applications.
The group dialog allows you to change the way windows are grouped when tiled or cascaded.
The order dialog allows you to change the display order of buttons in the switchbar.
The auto-tile and auto-cascade options reposition/resize windows every time a new window is created or destroyed so as to make all of the windows more accessible.
The auto-arrange option re-arranges minimized icons (when the switchbar is turned off) whenever an icon window is closed.