Version History and Technical Background
Manufacturers are free to implement different features of the OS in their devices or even add new features. This version history describes the officially licensed version from Palm/PalmSource/ACCESS.
All versions prior to Palm OS 5 are based on top of the AMX 68000 kernel licensed from KADAK Products Ltd. While this kernel is technically capable of multitasking, the "terms and conditions of that license specifically state that Palm may not expose the API for creating/manipulating tasks within the OS."
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