Development of applications for MetaTrader 4 Client Terminal requires the knowledge of MQL4. This present textbook will help you create your own Expert Advisors, scripts and indicators and incarnate in them your ideas – your algorithms of profitable trading. The textbook is intended for a large number of readers without experience in programming that want to learn how to develop automated trading applications for MetaTrader 4 Client Terminal. The textbook is designed in such a method that to make learning MQL4 as convenient and consequent as possible.