Need to call client side DLL from browser

Question

I got requirement from client that when any user swipe their card then their details should be capture in web page automatically on client side. However same we are doing in

Answer 1

After gone through some links, it seems it can be possible through following option.

Option 1:

• Firefox allows you to create XPI extension aka "addon"
• Chrome has extensions

Calling a .dll function from a html page that runs on chrome and firefox

Option 2:

Create plug-in for those browser are written using the NPAPI.

How to write a browser plugin?

Option 3:

Write signed applets to call dll that runs from a html or any web application. It almost run on all browsers. Here is the link for sample

http://www.javaworld.com/javaworld/jw-10-1998/jw-10-apptowin32.html