Introduction

The Mosel environment may be extended by means of modules. A module may bring into the Mosel Language:

• constant symbols
• functions and procedures
• types
• operators (like `+') to be applied to the types introduced by the module
• control parameters
• IO drivers

Mosel comes with a default set of modules (like mmsystem or mmsheet) but a user can implement his own modules which are a special kind of Dynamic Shared Object (DSO) written in the C (or C++) programming language.

The Mosel Native Interface is a set of conventions that a DSO must respect to be accepted as a module by Mosel. This document describes these conventions and also gives a comprehensive list of the Mosel functions that can be accessed from a module.