smartlist

i'm new to procmail, where can i find smartlist and a detailed documentation?
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->->->->->->->->->   <-<-<-<-<-<-<-<-<-
->  Admin of Valhallian Productions  <-
->  Owner of Valhallian Productions  <-
->  Master Programmer at Metro Prep  <-
-> Temlin Lord of the Night Stalkers <-
-> RedFang Lord over all Lords <KoR> <-
-> WebKid Lord of The Morning, mIRC  <-
->->->->->->->->->   <-<-<-<-<-<-<-<-<-