The structure of open nets, like the Internet, is highly dynamic, as the topology of component networks continuously evolves. In this context, node connectivity is a key aspect and a language for distributed network-aware mobile applications should provide explicit mechanisms to handle it. In this paper, we address the problem of expressing dynamic changes of node connectivity at linguistic level and, in particular, we focus on a slight extension of the language KLAIM, that is targeted to this aim. The extension consists of the