MQL4 Reference 
MQL5 features MQL5 functions Market Info
Getting Market Information
These are functions intended for receiving information about the market state.
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SymbolsTotal
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Returns the number of available (selected in Market Watch or all) symbols
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SymbolExist
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Checks if a symbol with a specified name exists
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SymbolName
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Returns the name of a specified symbol
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SymbolSelect
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Selects a symbol in the Market Watch window or removes a symbol from the window
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SymbolIsSynchronized
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Checks whether data of a selected symbol in the terminal are synchronized with data on the trade server
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SymbolInfoDouble
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Returns the double value of the symbol for the corresponding property
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SymbolInfoInteger
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Returns a value of an integer type (long, datetime, int or bool) of a specified symbol for the corresponding property
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SymbolInfoString
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Returns a value of the string type of a specified symbol for the corresponding property
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SymbolInfoMarginRate
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Returns the margin rates depending on the order type and direction
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SymbolInfoTick
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Returns the current prices for the specified symbol in a variable of the MqlTick type
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SymbolInfoSessionQuote
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Allows receiving time of beginning and end of the specified quoting sessions for a specified symbol and day of week.
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SymbolInfoSessionTrade
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Allows receiving time of beginning and end of the specified trading sessions for a specified symbol and day of week.
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MarketBookAdd
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Provides opening of Depth of Market for a selected symbol, and subscribes for receiving notifications of the DOM changes
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MarketBookRelease
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Provides closing of Depth of Market for a selected symbol, and cancels the subscription for receiving notifications of the DOM changes
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MarketBookGet
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Returns a structure array MqlBookInfo containing records of the Depth of Market of a specified symbol
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