DatvExpressServerApp is an alpha-release program to transmit DVB-S DATV running only on a windows PC with the hardware board. (no Linux) This software was a pre-cursor to the Express_DVB-S_Transmitter software.
DatvExpressSdrApp is an alpha-release program running on a windows PC to transmit FM or SSB with the hardware board. (no Linux needed)
All these applications are experimental and are likely to be full of
bugs. They are provided as a service to the DATV-Express community.