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Data in the Window Structure
When an MDI application registers a window class, it may reserve extra space
in the window structure for application data specific to this particular class
of windows. To store and retrieve data in this extra space, the application uses
the GetWindowWord, SetWindowWord, GetWindowLong, and SetWindowLong functions.
To maintain a large amount of data for a child window, an application can
allocate memory for a data structure and then store the handle of the memory
containing the structure in the extra space associated with the child window.
Related Links
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Win32 Multimedia Programmer's Reference (mmedia.hlp)
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