Stavros Kassinos has generously donated an example [L1 ] which demonstrates how to use Applescript as an IPC mechanism (Inventory of IPC methods) for the control of a legacy Fortran application by a thin Tcl wrapper.
Cameron Laird is exceptionally fond of this architecture of thinly wrapped legacy applications, and has published several pieces on it, including a three-part series [L2 ] for "Regular Expressions [L3 ].