Community URL refers to the URL of a community page. Typically, the community URL is http://server/portal/dt?dt.community=CommunityName. The community home URL http://server/portal/dt?dt.community will take the user to the community system home page (if visible to the user).
Community URLs can be:
Bookmarked in a browser.
Emailed to another user who can click on the link from their mail reader to access the community.
Entered directly into a browser, by hand.
Community URLs are cross-organization. The same URL will work in any community enabled organization. This allows a user in one organization to send a community URL to a user in another organization. If a community URL is accessed by an unauthenticated user, the user is redirected to a login page and then taken to the community after successfully logging in. The community system home page does not require login. If a user is a member of a community, the community URL will take the user to the community member page. Otherwise, the user will be taken to the community visitor page.