Allstocks.com's Bulletin Board: what the difference between sending order to INET , ECN ,MARKET MAKER or SUPERMONTGE

This is topic what the difference between sending order to INET , ECN ,MARKET MAKER or SUPERMONTGE in forum General Investing Topics at Allstocks.com's Bulletin Board.

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Posted by iiiqqqeg on :

i c these options on my ameritrade order screen but i don't know what's better or does it make a difference to make the order AUTO or to send to any of those?