How to discover if a software was installed on user machine via web

Question

Here in my company we have a lot of .NET softwares both Windows Forms and Web Forms.

Now we have some challenge, we need to auditing if the user has some pirate softwares on his machine.

For Windows Forms was easy to access the windows registry.

So, how we can do for Web Sites? Cuz the user could only work on the Web Site if the AGENT was installed.

I was thinking on the Login Page, we could somehow validate if the user has the AGENT installed, if not we redirect to the new page for installing this AGENT.

PS: AGENTE will be a Windows Server.

My question is:

How can i validate via Web Site if the user has or not the AGENT installed?

Some1 has other method?

Answer 1

您能否在网站上提供可下载的工具来审核用户的计算机并提供登录或启用帐户所需的密钥？