Netcentric thinking provides the ability of outside devices and systems to insinuate themselves into the operation of an embedded device. Netcentric systems are defined as a set of connected devices, embedded devices, information appliances, desktop computers and servers. In a sensor-to-strike scenario, the chain of events that connect the initiation of a control event to its result is not within a closed space. The chain may incorporate information gathering devices and weapons a thousand miles apart, or any of a myriad of devices in a more local confederated environment. System architectural approaches now need to consider determinism not only on the control side, but the communications side as well. This affects the design and use of computer hardware and software, and supporting tools. System designers can no longer work within the confines of closed systems. Systems cannot be constructed in a context where designers have relative control over all aspects of the design. This paper investigates two critical software technologies that address the open systems aspects of network centric systems. In particular, publish/subscribe mechanisms and service discovery mechanisms are investigated. Issues relating to determinism, reliability, predictability, security, and scalability are discussed.