Processing of Notebook control messages in the PM Bidirectional environment is the same as in the non-bidirectional PM environment. However, the Notebook control is sensitive to its Bidirectional attributes and handles formatting and presentation accordingly.
When the notebook control has right to left window orientation, the page arrows have their roles reversed: the left arrow turns the pages forward, whereas the right one turns them backwards. The text of tabs is converted according to their bidi attributes.
The WM_SETBIDIATTR dynamicaly modifies the bidi attributes (and as a result - the appearance) of the notebook control. It will also send appropriate messages to the user-defined page windows.