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1) Any problem changing the first order from limit to stop limit or mkt.... does this mess around w/ any of the other functions?
Yes, No
... Can i change the hot key set up to a mkt order OR change the limit on the order line to mkt (my choice?)
No, while configuring the Hot Keys, a Bracket Order can only be attached to a Limit Order. After the orders have been generated you may change them.
.2) If my first order is a buy limit or buy stop, and the order doesn't get filled.... are the bracket sell orders "live", or do they not go "live" until the order on the first line (the buy order) is executed?...
The Bracket Orders only go live when the Parent order is filled.
There is a problem with partial fills: I know of one case, where a trader had a partial fill and the TWS did not xmit the bracket orders, but cancel them. I did have a partial fill too and the TWS did xmit the Bracket Orders. I do not know the difference, so you have to watch your orders.
You have to watch your Bracket Orders also at Market Close: it might happen that none of your e.g. sell orders get filled. If you do not want an overnight position, you should exit the trade manually and cancel the pending orders.
Regards
Bernd Kuerbs