This chapter will describe briefly how to use Perl (Practical Extration and Report Language, or, according to some, Pathologically Eclectic Rubbish Lister) in KildClient. Even though it will give a few examples of things that would certainly be known already by people who know Perl, this Chapter is not meant to be a Perl tutorial. If you want to learn Perl from the start, you should read its man pages, find a tutorial or a good book on the subject (there are plenty of these). Some knowledge of Perl will certainly help in understanding this Chapter.