EA bridge
An architecture where an Expert Advisor runs inside the MetaTrader terminal and exchanges messages (over files or sockets) with an external Python ‘brain’. Unlike the native package it is platform-agnostic and covers MT4 and MT5, at the cost of an extra moving part; DWX Connect is the reference implementation.
First used in Lesson 3.1 · MT5 + Python architecture — the lesson that makes this term real.