It does not seem to be explained either in the Listowner's
Manual (INFO OWNER) nor the Keywords appendix (INFO KEYWORDS).  Thus,
you have to go to the FAQ, 'er I mean LSTOWN-L notebook archives:
 
/* --------------------- clip and save ---------------- */
//ListSrch JOB Echo=no
Database Search DD=Rules OUTLIM=5000 f=mail
//Rules DD *
s quiet: in lstown-l where sender contains eric
index #.5 date.8 sender.17 subject.46
print
/*
//  EOJ
/* --------------------- clip and save ---------------- */