It is desirable and sometimes necessary to reprogram sensor nodes through wireless links after they are deployed, due to, for example,the need of removing bugs and adding new functionalities. The process of propagating a new code image to the nodes in a network is commonly referred to as code dissemination. In hostile environments, where there may be malicious attacks against wireless sensor networks, code dissemination faces threats from both external attackers and potentially compromised nodes. This demo will show how Seluge, asecure and DoS-resistant code dissemination system based Deluge, worksin wireless sensor networks. Our demo will consist of two parts: (1) ademo in an on-site small-scale network, and (2) a demo in a remote test-bed named WiSeNeT, which is physically deployed in Engineering Building II at North Carolina State University.