The overall objective of HADA-TDT (Low Cost Test Tool for Interactive TV Applications) is to create a networked test environment shared by communities of iTV developers that allows then to easily try their applications in a real DTT system, supporting different consumer STB. In this way, HADA-TDT opens-up opportunities for small companies or free-lance professionals to participate in the DTT revolution, focusing on functional aspects of services and applications and avoiding expensive and long training on DTT systems technology