Minutiae
OPL interfaced with advanced Psion Series 3 features by means of operating system CALLs, but in the later Psion Series 5mx this was changed to a so-called 'OPX' library, stored in the system ROM (the Z drive).
Other OPL features include those with a letter 'g' at the beginning, for graphical functions; those with a letter 'm', for menus; and those with a letter 'd', for dialogs.
Read more about this topic: Open Programming Language
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