Message Passing Interface (MPI) allows a group of computers in a network to
be specified as a cluster system. It provides the routines for task activa
tion and communication. Writing programs for a cluster system is a difficul
t job. In this paper: the Message+passing Interface is presented. Parallel
programs using the WMPI, a version of MPI, to solve the pi(pi) calculation
the quick sort algorithm and the Torsion problem are presented. The program
s are written and compiled in Microsoft Visual C + +.