Developing MQL5

Overview

Build around MQL5's event model and live symbol rules. Treat compilation, trade acceptance, and profitability as separate claims requiring evidence.

Workflow

1. Classify the artifact before coding:

   Need	Program	Required handler
   Automated trading	Expert Advisor	OnTick and/or other EA events
   Chart calculation	Custom indicator	OnCalculate
   One-shot action	Script	OnStart
   Chart-independent process	Service	OnStart
   Reusable code	Include/library	Called by another program