If you buy the Programmable XBee S2C kit (XK2-Z7SB0) you will receive a Programmable XBee S2C module (SMD module) and a XBee S2C development board (apart from other accessories like a USB X-Stick).
If you want to build a prototype with these modules you need to connect wires from the module to a breadboard. This complicates things because the S2C are SMT devices.
Furthermore, some pins of the S2C module are connected to the development board, so if you want to use those lines for other purposes you need to disconnect those pins from the development board. In the default kit you are not able to do that. Unplugging the S2C module and soldering it in your proto board is not a good solution, unless you have plenty of modules to spare.
The best solution for building a prototype with the Programmble XBee S2C is to use an intermediate board between the development board and the S2C module like the one shown below. This board is not currently available for sale, you will need to have your own manufactured from these Kicad board files.
With an intermediate board you can isolate any S2C pin from the development board by removing the jumper associated to the proper line. This adaptor board also works great for the Programmable XBee 868 / 865 SMT modules.
Happy prototyping! Questions or comments? Let us know!