any body know what framework msn front page developer use [closed]

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I am now working on a huge site to developed it from scratch , but it should be light, fast , secure and optimize, for that i am looking to client side architecture, even the site is fully dynamic have millions of users and products. but still i want to use ajax , json and web services for quick response. But i am interesting to use client side archeticture like yahoo , google , and msn

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know your needs before looking for tools and frameworks.

No one should consider what tool I should use, before knowing the requirements of the project.

write them down, know your skills, and from this point, start to look for the right tools .