Calling external functions with WingZ for Windows 3.0

Well knowing WingZ under UNIX I need to write code for an IBM PC (yes I know, but sometimes we have to do this...). I am using WingZ for Windows 3.0. Even with the exemples given with distribution disks I am not able to call external functions. The "get external xxx" seems to run, the same for "remove external", but calling functions always return "ERROR 61" or "Unable to call function"... Who can help me ? Thank's a lot in advance PERU Michel European Synchrotron Radiation Facility Grenoble FRANCE peru@esrf.fr