This Technical Note discusses extensions to SetWTitle and GetWTitle in System Software 5.0 and later which allow handles to be used as window titles.
Prior to System Software 5.0, window titles were pointers to Pascal-style strings (with a leading length byte), but now window titles can be stored in handles, with bit 31 of titlePtr set to indicate that the parameter is actually a handle.
Once you call SetWTitle with a handle for the title parameter, the handle belongs to the Window Manager,which will dispose of it when the window is closed or retitled. You must not dispose of the handle yourself, and you must not change the data it contains.
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