Question : Get client's computer specification from browser

Hello all,
I'm Writting an app for a client of mine that has 150 PC with many more laptops that comes and go.
I need to be able to identify the computer asking the service from the local server (intranet) , and be able to know about this computer some hardware info, inorder to send back to the clients computer the right software patch.
where do I start??
I need some guidline.
thank you

Answer : Get client's computer specification from browser

well I am afraid for security reasons you are only able to retrieve browser information as posted above using general ways.