Access List by host and hostname?

Is it possible in squid, to setup certain sites which the squid server will NOT
allow people to access?

also.. is it possible to deny users access to certain domains based on their
domain name...

     ---------------------------------------------------------------------
    | Skeeve Stevens - myinternet personal.url: http://www.skeeve.net/ |
    | email://[email protected]/ work.url: http://www.myinternet.net/ |
    | phone://612.9869.3334/ mobile://0414.SKEEVE/ [753-383] |
    | address://p.o box 1035 epping, 2121, australia icq://6576270 |
    | - This email is (c) 1997 by Skeeve Stevens - All rights reserved - |
     ---------------------------------------------------------------------
Received on Wed Jan 07 1998 - 04:13:35 MST