MQL4 Reference 
Window functions WindowHandle
| int WindowHandle( |
string symbol, int timeframe) |
Returns the system window handler containing the given chart.
If the chart of symbol and timeframe has not been opened by the moment of function calling, 0 will be returned.
Parameters:
| symbol |
- |
symbol name. |
| timeframe |
- |
Timeframe. It can be any of Timeframe enumeration values. 0 means the current chart timeframe. |
Sample:
int win_handle=WindowHandle("USDX",PERIOD_H1);
if(win_handle!=0)
Print("Window with USDX,H1 detected. Rates array will be copied immediately.");
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