If you've used a Slice of Radio or any of the Ciseco RF modules like the SRF or RFu328, then you might be sad to hear that Ciseco/WirelessThings are no more. Unfortunately, that also means that the documentation doesn't exist any longer either, as their web presence disappeared. While I don't have much documentation, I did create a list of AT commands that the SRF and XRF radio modules accept.