Mobility is being touted as a next step in the computing revolution. Increased mobilityimplies increased reliance on wireless networks. However, techniques and tools for handling the variable and generally lower Quality of Service (QoS) offered by this typeofnetwork havenot yet emerged. This problem is exacerbated by the fact that the standard communication protocols are unable to exploit such QoS as is available. Finally, advances in PCMCIA card technology mean that mobile applications must deal with a changeable computing platform. The combined inability of applications to adapt to a varying execution environment and the poor performance of communication protocols in a mobile environmenthave led us to develop a mobile application support architecture called the Communica- This work was done at the UniversityofWaterloo with support from Motorola Canada Ltd. and the Natural Sciences and Engineering Research Council. Contact dkidston@uwaterloo.ca for more information.