In Table 1 we show the transmission time in microseconds (s) to send a 1 byte message in each of the environments tested. In SM the mpiJava wrapper adds an extra 94s (140%) and 226s (152%) compared to WMPI and MPICH C respectively. In DM the mpiJava wrapper adds an extra 66s (11%) and 282s (42%) compared to WMPI and MPICH C respectively. The Wsock figures are those for a WinSock implementation of PingPong benchmark using TCP. Linux results will be presented during the conference workshop.