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When an emergent case occurs, to give proper and immediate emergency treatment to a patient is as important as to transfer him or her to the hospital as early as possible. For this circumstance where first aid usually happens in an ambulance, we developed the Ubiquitous Integrated Biotelemetry System for Emergency Care (UIBSEC) based on wireless 3.5G HSDPA module in order to provide more proper and active medical care to a patient. For this system we performed experimental tests on the HSDPA module to measure practical performance values with respect to throughput and RTT (round-trip-time) and compared the result with the theoretical specifications. In the course of developing this system we created the C#-based Network Solution Library (NSL) which helps drastically reducing the overhead. We applied this library to components of the UIBSEC - two kinds of clients and one central server - and confirmed that it works smoothly in wireless networks and it is useful in the future development process of network applications.