[Mailman-Users] Subscription options help

[Trek*Spot Webmaster]

I'm using mailman for a mailing list on my site.  Is there an address subscribers can mail to to unsubscribe (i.e. unsubscribe-list@domain.com)?  Also, can I write a cgi form for subscription?   Curry O'Day Trek*Spot Webmaster http://www.trekspot.com