Basics - GIMP 2.6 for Photographers: Image Editing with Open Source Software - page 40

In the View menu, tools such as rulers and a quadratic grid can be blended
in and out, and you can choose the background color of your image window.
The menu Windows offers possibilities to open or re-open additional windows
or docks (Layers, Channels, Paths, and Undo). The Help menu offers access to
the help functions of the program.
Most of the functions and modules enabling you to create script-fus,
buttons for websites, 3D objects, and logos with effects that where attributed
to the Toolbox under the Extras menu in previous versions of GIMP can now
be found in File > Create, Edit and Filters .
The next time you start GIMP, you will find the windows that were open
the last time you used it.
Figure 1.18
The Preferences > Environment window lets you set the number of undo steps and the amount of
memory allocated to GIMP.