从Web应用程序访问客户端设备的最佳方式

I need to provide support for various scanners and printers to an Intranet web application. Basically the user needs to be able to take pictures using his webcam or camera, scan using his scanner and print through his printer. Because this is an Intranet application, compatibility is not an issue. I can ensure the user has all drivers installed. But the client insists that the application should be embedded inside the browser and not run in a native window. All client machines are Windows PC, but the client is flexible with browser choice.I need to provide support for various scanners