How do I send data to a html page?

Hello,

I am building an application that works alongside explorer. The application generates some data that I then need to enter into som text fields on an explorer page. The application itself is currently in c# but this element could be rewritten in a different language. I am currently using Sendkeys but this relies on the windo having the focus, which I can;t guarentee, so I woudl like to find a way of sending data directly to a field.

Any advice or hellp woudl be greatly appreciated.

Steve