Please advice

Hi .. I am still newbie to Unix ...
May I know how can I unzipped the file procmail.tar.gz ?
and how can I execute the file that I have downloaded ?

Can you please give me the URL where I can download the utility 
to unzip the gz files ?

Thanks ...

         _\\?//_
        (' ?-? ') 
®®®®®® ???-(_)-??? ®®®®®®
Any comments and ideas are appreciated ...
Name   : Kwan Weng Hong
E-mail : kuanwh(_at_)estina(_dot_)mal(_dot_)hp(_dot_)com