MSDN

MSDN stands for Microsoft Developer Network

,Microsoft specially made MSDN to give support for developers such as documentations help

knowledge base articles and many other resources that developers may need to build up there

applications, MSDN is very important and every developer can not live without it, so Microsoft

released a copy of MSDN with Visual Studio.Net to let developers access it locally without

logging to the internet, but MSDN website is frequently updated than the local one, so if you have

a broadband access to the inertnet I would recommend relying on the online MSDN