Listening for information in wireless networks

Hi everybody,
I am working with wireless networks and now I need to create a very simple, light weight service repository. Let's say that it just associates the name of a service to an IP address.
The problem I have is that I need to hear the transmission of other nodes (computer or devices) to detect if they are nodes registering services in other nodes or perhaps nodes answering queries comming from other nodes. In both cases, the transmission is not intended for the node listening, which wishes to listen so that it can save such information in its own service repository.
Does anyone know how to obtain information from the network layer when it is not directed to you?
I've been using Jini, but now I need to create a very light service repository (called lookup in Jini).
Thanks,
Oscar

Hmmm, I wonder of 1Password works in this instance, 30 day free trial anyway...
http://agilewebsolutions.com/products/1Password

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