Abstract: The use of portable computers and wireless networks is rapidly spreading. But the important differences between wireless and wired environments make it indispensable for applications to adapt to the type of environment in which they execute. In this paper we focus on the adaptation to mobility of a medical hospital prescription application, which will allow a caregiver to enter a prescription when being at patient's bed. Our solution is to design a middleware environment which enables to adapt transactions processing to the quality of the wireless link. When the quality is good, transactions are executed on the server, whereas when it is weak, transactations are executed on the portable computer.

Keywords: Middleware, transactional systems, health care, wireless LAN, mobility.