Details of the TimeInForce values supported by Whisperer Enterprise for both categories are provided below.

TimeInForce	Nature	Colloquial Name	Description	168./EffectiveTime	126/ExpireTime	1629/ExposureDuration
IOC	Aggressive	Immediate or Cancel	The Order must be executed immediately, at least in part (Partial fills are allowed), otherwise the Order is cancelled. AKA 'Fill and Kill'.	Optional	-	-
FOK	Aggressive	Fill Or Kill	The Order must be executed immediately, in full (no Partial fills), otherwise the Order is cancelled.	Optional	-	-
DAY	Resting	Good For Day	The Order expires automatically on close of the trading day, if it is still unfilled.	Optional	Optional	Optional
GTC	Resting	Good 'Til Canceled	The Order remains active until it is either executed or cancelled. NOTE: Maximum possible duration is one trading week, but is equivalent to DAY for most Venues that reset daily.	Optional	-	-
GTD	Resting	Good 'Til Date	Order is active until a specified time. TWAP?	Optional	Mandatory	-
GFT	Resting	Good For Time	Order is active for a specified duration. TWAP?	Optional	-	Mandatory
OPN	Resting	At Market Open		Optional	-	-
CLS	Resting	At Market Close		Optional	-	-
GFA	Resting	Good For Auction		Optional	Optional	Optional

Order Types

There are three broad categories of OrderType:

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