If you want to switch between different sets of docks easily, you can use the Workspaces feature. You might want to have setups for different people who use the one computer, or for different tasks.
To save a list of the currently open docks into a file, select "Save Workspace " from the File menu.
While the Save dialog defaults to DragThing's "Workspaces" folder, workspace files can be stored wherever you like. A workspace file only stores aliases to dock files, not the docks themselves.
To open an existing workspace file, select "Open Workspace " from the File menu. This will close all the currently open docks and open those listed in the workspace file instead.
While the Open dialog defaults to DragThing's "Workspaces" folder, workspace files can be stored wherever you like.
You can also drag a workspace file to a dock and double-click it to switch, or double-click it from the Finder.