Bobby-
ISLD is a limit book, which, by definition, cannot accept market orders.
Brec's point is that you cannot enter a market order directly into the ISLD ECN. Obviously you can enter one at Datek, but if there is no ISLD at the inside market, then Datek leaves the ISLD system to fill the order.
In one sense, Datek is to ISLD as ARCA is to TNTO. Datek/ARCA will accept a limit or market order, and will attempt to match within ISLD/TNTO. If this is not possible, then Datek/ARCA will attempt to fill in the open market.
BTW, Datek will not allow you to cross an ISLD bid/offer away from the inside market. It will attempt to fill with an MM at the inside, while some ISLD user gets the execution you were looking for with a direct cross.
Hope this makes sense.
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