As it is implemented using normal OPL files, certain aspects of ER6 OPL cannot be faked, and so they have to be contained (and sometimes abstracted) by wrapper procedures. For this & other reasons there also exists a Symbian version of this package, which should allow exactly the same source code of a program to be compiled on both Psion & Symbian devices - if it is used correctly.

This package can be used to port an existing Psion app to Symbian devices, but doing most of the work on a Psion, and keeping the source code for both devices the same. This package can also be used to port a Symbian app to Psions, or even just write new apps which will easily run on both systems.

This package has been put in the Public Domain by Chris S Handley, so that it may be used by as many programs as possible, including Open Source programs.