![]() ![]() An EA is usually launched at the moment when a new tick comes. ![]() For example, an Expert Advisor (EA) does not work continuously all the time. Each application is executed according to the rules set for programs of a certain type. As appropriate to the current market situation, ticks may be received more or less frequently, but each of them brings a new quotethe cost of one currency expressed in terms of another currency.Īn application operating within the client terminal may work over a long period of time, for example, several days or weeks. Ticks are delivered to every client terminal by a server that is installed in a dealing center. The notion of a tickĪ tick is an event that is characterized by a new price of the symbol at some instant. Ticks provide the client terminal with information about price changes on the market. The situation on financial markets changes continually, which affects symbol charts in the client terminal. The MetaTrader 4 Client Terminal works with an online connection. ![]() Before we start a detailed presentation of the rules of writing programs, it is necessary to describe the basic concepts that characterize a program and its interrelations with the information environment. The subject of our interest is a program written in MQL4. ![]()
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