Objectives: to design and implement mediators dedicated to access heterogeneous information sources in a homogeneous way. Method: processes translate a query into the syntax of a target source built thanks to the UMLS knowledge sources and a catalog of information sources. Communication services connect users with information sources at the point they deliver results. Results: examples show the benefits healthcare professionals may found in searching information in this way. Discussion: improvements on the current developments may be done according to the current architecture of ARIANE. Specially, the user interface should be easier to use than the present one.