What?
It allows players to seek reviews, by the third umpire, of decisions by the on-field umpires on whether or not a batsman has been dismissed.
When?
A player can request a review of any decision by the on-field officials concerning whether or not a batsman is dismissed, with the exception of "timed out". No other umpiring decisions are eligible for review. Each team can make three unsuccessful requests per innings, which must be made within a few seconds of the ball becoming dead; once made, the requests cannot be withdrawn.
Who?
Only the batsman involved in a dismissal can ask for a review of an "out" decision; in a "not out", only the captain or acting captain of the fielding team. In both cases players can consult on-field teammates but signals from off the field are not permitted.
How?
A review request can be made by the player with a 'T' sign; the umpire will consult the TV umpire, who will review TV coverage of the incident before relaying back fact-based infrm't'n.
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