After the slide on Wall Street on Tuesday regional equites here are feeling the heat. Nikkie 225 is down 5% from its record high hit on TuesdayIn South Korea, KOSPI futures halted after a 5% slide. In brief:The 'sidecar' is a rule that lets the Korea Exchange (KRX, the operator of SK's bourse) halt futures trading of equities during periods of extreme market volatility.Triggered when the benchmark KOSPI futures contract moves more than 5% from the previous close.The KRX limits program trading for five minutes as a 'circuit breaker'--- More:KOSDAQ halted too6% drop programme trading halted for 5 minutes This article was written by Eamonn Sheridan at investinglive.com.