Yes, if you sign the applet yourself, you can do a completely hidden file transfer with Jfile. The CAB and JAR files provided with Jfile are signed by SoftArtisans. As an extra security feature, the non-visual component will prompt the user to confirm an upload or download. By creating and signing your own CAB or JAR file using the unsigned classes we provide, you can eliminate this confirmation dialog. Please see the following documentation:

Signing the Jfile applet: http://support.softartisans.com/docs/JFile/install_signapplet.htm