The source code for the Palm keyboard is available, start from there.
While it is available as part of the licensed Palm OS source code, the license does forbid you from copying and pasting that code into your own programs. You should only use the OS 3, 3.5, and 4 sources for debugging and optimization.
-- Ben Combee, senior DTS engineer, PalmSource, Inc. Read "Combee on Palm OS" at http://palmos.combee.net/
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