Specify pair for Open[2]

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How can I specify the pair for Open[2]? 

I want it to apply to USDCHF regardless of the chart that the expert adviser is attached to.

[William Roeder]

You don't. You have to use the functions

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But I cannot seem to go back two seconds with  iOpen().  How can I get the open price for a specified pair exactly two seconds ago?

[Simon Gniadkowski]

hknight:
But I cannot seem to go back two seconds with  iOpen().  How can I get the open price for a specified pair exactly two seconds ago?

Read the replies to your other post .. .  you CANNOT unless you record the prices tick by tick by tick . . .

[Nathan]

HKnight,

The MarketInfo() function comes in handy sometimes, Hahaha! ;) You may also consider recording prices (tick-by-tick) OR ;) write code to imitate a timer which will check every two seconds...

Thank you