Fortran experts -- The MPI 2.1 spec lists some Fortran callback signatures as having variable arguments. I do believe that this is a holdover from a long, long time ago, and I believe that whoever wrote this section simply copied the C prototypes. If the spec is wrong, I'd like to get it fixed during the ongoing MPI-2.1 process. See MPI-2.1 p266 line 29, or http://www.mpi-forum.org/docs/mpi21-report-bw/node183.htm#Node183. The Fortran callback signature is expressed as: SUBROUTINE COMM_ERRHANDLER_FN(COMM, ERROR_CODE, ...) INTEGER COMM, ERROR_CODE 1. Does Fortran have variable length argument lists (akin to C varargs)? If so, was it introduced in a specific version of Fortran? (I realize that F77 compilers do no checking and you can pass as many/ few arguments as you want) 2. If Fortran has variable length argument lists, what is the correct syntax to express them? Is "..." correct? Or is there a different way? Thanks. -- Jeff Squyres Cisco Systems