Liferay 6 Release candidate is out. Liferay Portal 6 Release Candidate Released. Here are few screenshots describing overall improvements , new features.
Overall better navigation
Here i am starting with details for liferay tables. List is updated upto 5.2.3 community release. Will keep updating this as i will get more time. In case you want the tables for some specific functionality , please comment on Post.
In liferay you can define listeners for an entity. They work like triggers and necessary code will be called based on what action is performed on the entity (update , create etc).In these three steps you can understand how LDAP is synched with Liferay DB.
World of Liferay portlets (Friends Activity, Recent Activity) give you feed of activities about your friends and overall.Here I am explaining how Blogs portlet generates feed for these portlets.
You can follow same steps to implement it, to display your portlet in feeds.
What is web service
Web service is nothing but exposes your software as service for other application over the network. Applications can be written in any programming language and if they support the statandard they can be integrated.It removes the concern of writing custom interfaces and REST/HTTP Post based calls for each integration point.