[OT?] Exchanges reactions to big mistakes/manipulations?

["ian.b" <ian_b@xxxxxxxxxxxxxxxxxx>]

Dear List,

Last year, there were sessions with unusual movement 
caused by mistaken orders or a unusual situation (i.e. e-mini).

Could you send me links, notifications, explanations
from an exchange or a brokerage regarding trade cancellation? .

I would like to know  the way the exchanges handle this.

Regards
ian