These subroutines broadcast data from the host process (or, for no-host-process implementations, the designated I/O process) to the grid processes. They would typically be used during initialization to set global constants -- the host process would read the constants from a file and then broadcast them to the grid processes.
subroutine mesh_bcast_int(isize, int_array)
integer int_array(isize)
subroutine mesh_bcast_real(isize, real_array)
real real_array(isize)