MQL4 Reference 
Global variables GlobalVariableGet
| double GlobalVariableGet( |
string name) |
Returns the value of an existing global variable or 0 if an error occurs.
To get the detailed error information, one has to call the GetLastError() function.
Parameters:
| name |
- |
Global variable name. |
Sample:
double v1=GlobalVariableGet("g1");
//---- check function call result
if(GetLastError()!=0) return(false);
//---- continue processing
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