Appendix III. Special Orders

Server-side vs Client-side

Platform	Brackets	Trailing Stop	OCO
Ninja	Client side	Client side	Client side
TWS	Client side	Client side	Client side
SS	Server side	Server side	Server side
TT	Client side	Client side	Client side
CQG	Server side	Server side	Server side
Rithmic	Server side	Server side	Server side
Transact	Client side	Client side	Client side
Simulator	Client side	Client side	Client side
Tradestation	Server side	Server side	Server side

Note: client-side orders may be rather unsafe.

OCO

For all platforms, the price of a stop leg of an OCO cannot be modified to an invalid price, i.e., at or above the offer for a buy stop or at or below the bid for a sell stop.

Size increase modifications of OCO orders are not allowed across all platform connections. Allowed price changes can be done on each order individually. Decreasing size modifications can either be done on each individual leg or is automatically updated to the other leg, depending on the platform connection, as detailed below:

Behaviour	Platform
Size change of one leg automatically updates the other leg	S5
Each leg is modified individually; i.e., size modification of a single leg will not automatically update the other leg	CQG
Size change of one leg automatically updates the other leg	RIthmic
Size change of one leg automatically updates the other leg	Ninja, TWS, TT, Transact, Simulator

Brackets

Bracket secondary orders behave as OCO orders, as detailed above.

Trailing Stop

The trailing stop parameter controls the tick steps at which the stop order is updated. Trailing stops will not apply to an entry stop order or a leading (primary) bracket order.