IB "Sweep to Fill" order type

Is anyone familar with the "Sweep to Fill" order type? It's described as scanning for the best price and executing on it, but how is that different from a Market Order? There must be some type of difference, its actually looks on the helpguide like a limit order. Thanks in advance for any help
 
http://www.interactivebrokers.com/en/trading/orders/sweep.php?ib_entity=llc

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Resurrecting an old thread for the same Q. Does a sweep to fill order issue multiple, simultaneous orders IOC to all destinations at your limit price or better?
 
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