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The involved adding a PENSTATE structure to the Turtle structure and a boolean to keep track of if the PENSTATE is used. All access to the current pen state is done through a new accessor called GetPenStateForSelectedTurtle(), which will use either the global pen state or the g_SelectedTurtle.PenState, depending on if the selected turtle has its own pen state.

Any change to the turtle now also changes the currently used brushes and updates the status window, as appropriate.