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Open Programming Language
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==Minutiae== OPL interfaced with advanced Psion Series 3 features by means of [[operating system]] CALLs, but in the later [[Psion Series 5]]mx this was changed to a so-called <code>OPX</code> [[Library (computing)|library]], stored in the system [[read-only memory]] (ROM), termed the Z drive. 'OPX' libraries were also made available for the [[Nokia 9210]], [[Nokia 9300]] and [[Nokia 9500]] Communicators, adding OPXs routines for handling Short Message Service ([[SMS]]) and managing [[Bluetooth]] communication. Other OPL features include those starting with a letter: <code>g</code> for graphical functions, <code>m</code> for menus, and <code>d</code> for dialogs.
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