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Yes, it's easy to do.  Check out the FOREIGN function in "Help."  The 
SETFOREIGN function has a coding example that's easier to understand, 
though.
Luck,
Sebastian  
--- In amibroker@xxxxxxxxxxxxxxx, "John B" <cutejohn777@xxxx> wrote:
>
> Hello,
> 
> Using AFL is it possible to trigger buys in one symbol using a 
> different symbol?  ex.  Buy SPY when $VIX > 16
> 
> If so, how would I use it in the following 'example' using weekly 
data?
> Buy = MA($VIX,15) < Ref(MA($VIX,15),-1)
> where it would buy SPY when the $VIX MA(15) was less than a week ago.
> 
> Thank you,
> John B
>
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