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whatUseek Directory Site Listings:
Programmers' FAQ
- A small series 3a/SIBO programming FAQ.
Psion OPL Programming Reference
- The OPL programmer's reference from the Psion Series 3a distribution.
Twiddlebit Software
- EPOC and SIBO (Psion) project planning and advanced OPL development tools (Plan, Plan5, OPP, OPPDBG, GPRINTER.OPX).
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