On my site I offer a few items for sale only to special groups. I need to be able to create a page with, lets say, 4 items on it for sale but only seen/accessed by people I give a code or password to. Using the access restrictions in joomla would be hard because I'm not going to know who is who, and they would have to wait for me to manually give them access.
Each group gets different items, prices, etc... so I do not want one group seeing the others. Also, I'd like to limit the compitition from seeing it. They would need the password.