From Traderpedia

Definition: X TRADER is Trading Technologies order entry product. It incorporates single-click trade execution and a vertical market depth display.

TT's X Trader is widely used amongst professional and high volume traders due to its highly stable interface and high speed data connections. TT claim to account for as much as 50% of global futures volume executed through their platform.

TT is at the centre of a patent battle with many other ISV's over their claims to the design of the vertical price ladder, DOM and order entry layout of the X Trader interface.