The real author:

CrushD

The indicator to trail the stop levels in the Expert Advisors. Up and low boundaries of the channel have individual input parameters for setting:

input uint UpTrailPeriods=5; //The period of search for high               
input uint DnTrailPeriods=5; //The period of search for low

This indicator was first implemented in MQL4 and published in Code Base at mql4.com on 28.10.2007.    

Fig.1 The CandleStop indicator