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-- The 'GetClassLong' function retrieves the specified 32-bit (long) value
-- from the WNDCLASS structure associated with the specified window.
-- The 'GetClassWord' function retrieves the 16-bit (word) value
-- at the specified offset into the extra class memory for the window class
-- to which the specified window belongs.
-- The 'RegisterClass' function registers a window class for subsequent
-- use in calls to the 'CreateWindow' or 'CreateWindowEx' function.
-- The 'RegisterClassEx' function registers a window class for subsequent
-- use in calls to the 'CreateWindow' or 'CreateWindowEx' function.
-- The 'SetClassLong' function replaces the specified 32-bit (long) value
-- at the specified offset into the extra class memory or the WNDCLASS
-- structure for the class to which the specified window belongs.
-- The 'SetClassWord' function replaces the 16-bit (word) value at the
-- specified offset into the extra class memory for the window class
-- to which the specified window belongs.
-- The 'UnregisterClass' function removes a window class, freeing
-- the memory required for the class.
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