Why did I get a warning message about using Market orders when I did not use a Market order?

Stop orders are triggered when the market trades at or through the stop price (depending upon trigger method, the default for non-NASDAQ listed stock is last price), and then a market order is transmitted to the exchange.  A buy stop is placed above the current market price.  A sell stop order is placed below the current market price.  Stop orders may get traders in or out of the market.  The risk associated with stop orders is that they do not guarantee a price.  When a buy stop order triggers, the market order is transmitted and you will pay the prevailing ask price in the market when received.  When a sell stop order triggers, the market order is transmitted and you will pay the prevailing bid price in the market when received. …

The Close Currency Balance feature is only available for non-base currencies in the TWS Account Window. If you try to execute it from the base currency row of the Market Value - Real FX Balance area of the Account Window you will see it greyed out…

You can trade these order types in Client Portal: Limit, MidPrice, Market, Stop, Stop Limit, Trailing Stop, Trailing Stop Limit, Market on Close and Limit on Close. Additionally you can create an exit strategy using the Profit Taker and attached Stop-Loss orders from the…

Yes. When using the "Close" feature you can elect to close all or a portion of your positions on multiple assets with either a Limit or Market order. From there, you can select an Algo order to manage the order to close your position.

The steps to use the Close feature using Algo orders can be…