TS vs. IB limit ICE orders held?

[Tom <florida.broker@xxxxxxx>]

Good Morning,
Does anyone recall how Trade Station and Interactive Brokers handle 
limit orders for the Russell 2000 ( TFH ) traded at the ICE?  I forget 
the details as to whether they are sent to ICE when generated or if they 
are held by the broker(s) until the limit price is actually hit and then 
sent to the exchange. I do recall the topic being discussed previously 
but I can't locate any prior messages in my inbox.  Sorry to be redundant.
Thank you!

Tom