MQL4 Reference 
Array functions
A group of functions to work with arrays.
Arrays are allowed to be maximum four-dimensional. Each dimension is indexed from 0 to dimension size-1.
In a particular case of a one-dimensional array of 50 elements, calling of the first element will appear as array[0], of the last one - as array[49].
Using these functions (except for those which change quantitative and qualitative characteristics of the array) one can process
predefined time series Time[], Open[],
High[], Low[],
Close[], Volume[]
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