The goal of a parallel program is stated as to reduce the execution time regarding the fastest sequential program solving the same problem. Parallel programming is growing due to the widespread use ofnetwork of workstations in high performance computing. MPI has become the standard for implementingmessage-based parallel programs in distributed-memory computing environments. On the other side, visualprogramming environments try to make easier the task of developing applications. Delphi constitutes one ofthe most popular visual programming environments nowadays in the Windows operating systemenvironment. In this paper we present MPI-Delphi, an implementation of MPI for writing parallelapplications using Delphi. We explain how MPI-Delphi has been derived, how it has been used in a cluster ofworkstations with a mixed of Windows and Linux operating systems, and what MPI-Delphi is suitable for.