Author: Dave Lyons
Year: 1989
... discusses extensions to SetWTitle and GetWTitle in System Software 5.0 and later which allow handles to be used as window titles.
Apple II
Technical Notes
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Developer Technical Support
Apple IIGS
#61: Window Title Handles
Written by: Dave Lyons July 1989
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.
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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.
Further Reference
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o Apple IIGS Toolbox Reference, Volume 2