Listed trading halt re-open

What determines the first trade after a listed stock is halted? If there are GTC limit orders that will be filled due to gapping price, who gets the fill on the other side? The lowest/highest ask/bid?
 
Thanks for the link, will look into it later.

But maybe I can rephrase the question: during a listed halt, how can u guarantee first (or near first) execution when the stock re-opens?
 
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