WinDRM is a sound card program for digital voice and sending pictures. The software uses DRM, Digital Radio Mondiale, modified by Cesco, HB9TLK, for Ham radio. The minimum requirement is a 1 GHz computer running Windows 2000 or higher and one or two sound cards. It is recommended to use two sound cards with digital voice, as cheap as a usb sound card is, it should not be a problem to run two. DRM is open source software, and I do like open source! I have been playing with the software and when time permits I will try to use on the air. There is very good instructions on Jason, N1SU, site. If you have used this software, let me know what you think about it.