Summary: We review the design, selected applications and performance of WiPPET (Wireless Propagation and Protocol Evaluation testbed), a general parallel simulation testbed for various types of wireless networks. WiPPET has been written in TeD/C++, an object-oriented modeling framework that isolates network modeling from the underlying parallel discrete event simulator. We describe the techniques for modeling radio propagation (long and short-scale fading and interference) and protocols that promote scalability of parallel simulations at session and packet time-scales. We outline two selected applications of WiPPET: integrated radio resource management in a mobile wireless network; and packet losses due to mobility and short-scale fading over a radio link. We illustrate the efficiency of the simulator under tow partitioning schemes with parallel performance data obtained using the Georgia Time Warp optimistic simulator.