The DTC-300 StreamXpress is software that allows users to play MPEG-2 transport streams on a standard PC using a DekTec output adapter. It provides features such as integrated program and system information viewing, automatic transport rate computation from PCRs, endless looping playback with error correction, and error injection capabilities. The software is intended for applications such as universal stream generation, demoing equipment, and laboratory testing. It requires a Windows PC and DekTec output adapter to function.