General Documentation (PDF) (Thanks to Krzysztof Satoła )
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SundialSoft's Documentation ( Installation, Graphic, Pointers and more )
BFSoft's Absolutely Beginner's Corner
You could design UI with straight PocketC coding ...
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Lucky, PocketC developer Cory and Guy developed two excellent Graphic User Interface Designers. These designers will allow you design the interface with your pen, and generate source code that can be placed in your program.
Visual Form Buddy (New version coming soon)