To test mpiJava under Windows NT we had the choice of a number of MPI implementations to pick from. We chose WMPI from the Instituto Supererior de Engenharia de Coimbra, Portugal. WMPI is a full implementation of MPI for Microsoft Win32 platforms. WMPI is based on MPICH and includes a p4 device standard. P4 provides the communication internals and a startup mechanism. The WMPI package is a set of libraries (for Borland C++, Microsoft Visual C++ and Microsoft Visual FORTRAN). The release of WMPI provides libraries, header files, examples and daemons for remote start-up. WMPI can co-exist and interact with MPICH/ch_p4 in a cluster of mixed UNIX and Win32 platforms. WMPI is still under development and is freely available.