I recentlly came across this key word Dotnetnuke !!
i was curiuos to know about this ....
finally i came to know : Dotnetnuke is a Open Source Framework which can be used to build ASP.Net web applications.
This framework provides advanced features of developing projects.
"DotNetNuke is an open-source Web Application Framework ideal for creating and deploying projects such as commercial websites, corporate intranets and extranets, online publishing portals, and custom vertical applications. "