How to read a text file from a client machine using PHP.

Hi!

I want to read a text file that is located (at a known loaction) on a client machine using a Web page that is using PHP for back-end processing.

In particular what I'm exploring is to use Javascript to read data from the client machine. Is it possible? Or is there some other workaround?

The requirment for the same being, I need to send a Certification request (CSR) which is generated on the cleint machine and would be stored in a text file. The Web page (PHP) would then need to read this text file and send User details (entered in the web page) alongwith the CSR to a Certification Server.

Any inputs?
Thanks in advance!
GC.