What technology is there behind webDynpro?

I want to know that how sap netweaver converts webdynpro code to servlets and HTML and java script?
Provide any good materials if possible to understand this fundamentals.
Is there any way to insert manually javascript or HTML?

Hi
Check these links and you may get some idea
What is Web Dynpro?
What is Web Dynpro?
Why WebDynpro ?
Why WebDynpro ?
Why webdynpro and not BSP or JSP?
Why  webdynpro and not BSP or JSP?
BSP to WEB Dynpro
BSP to WEB Dynpro
Benifits of using Webdynpro
Benifits of using Webdynpro
Java vs. ABAP
Java vs. ABAP
regarding Java related webdynpro
regarding Java related webdynpro
Web Dynpro vs. Struts - a few questions
Web Dynpro vs. Struts - a few questions
What kind of applications are being developed with Web Dynpro?
What kind of applications are being developed with Web Dynpro?
This url links to a short pdf file describing the Webdynpro Java
"Inside WebDynpro Java" Pdf File 2.50 MB (54Pages) really Good One for Beginners
http://searchsap.techtarget.com/searchSAP/downloads/SAPPRESS.pdf
Regards,
Chandran

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