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Palm OS, a proprietary operating system used in the late 20th and early 21st centuries for personal computing devices, including personal digital assistants (PDAs), smartphones, handheld gaming systems, and Global Positioning System (GPS) devices. More than 17,000 applications were created for the Palm OS by licensed developers. American inventor Jeff Hawkins founded Palm Computing, Inc., in 1992, developing application software for early PDAs. After Palm merged with U.S. Robotics in 1995, Hawkins led the development...