Does the development system connect to the target system?
The development system can act as the target system, depending upon the processing/interface requirements. These are high-end server machines equipped with tons of memory and the fastest CPUs, so many solutions can be emulated with the box. Note that this is emulation, not just simulation. The processor can have application code running on it real time and communicate with cards in the PCI slots. This allows the user to put in network interface cards (Infini-band, 1GbE, 10GbE) and interface the system to other boxes or racks.