This will allow the hotkey to cancel the orders (applied to Charts/DOM or LevelII, doesn't apply to Trade Ticket windows)
With the Open and Unsent options you can select to cancel All, Buys, Sells, or UnderMouse. The UnderMouse option will only cancel the order over which the mouse is currently hovering.
You can also optionally specify the Account on which the orders should be canceled and the Symbol (or symbol list) for which the orders should be canceled. If not specified, the Account and the Symbol are taken from the window on which the hotkey is executed.