Metacomputer Online aims at utilizing multiple WAN-connected high performance systems as a computational resource for solving large-scale problems that are intractable on a single supercomputer. Since its inauguration in June 1996, the MOL initiative has developed: PLUS, a public domain software that allows to communicate between different message passing libraries (PVM, MPI,PARIX); HPCM, a homogeneous computer access to an Cray T3E in Jülich and a Parsytec in Paderborn; MICA, an application-specific metacomputer for industrial CFD applications