reinhard_jd wrote: I've tried some of the hints and esp. the SendKeys object helped a lot. you can try keybd_event Function tooo "Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow cheers, Alok Gupta VC Forum Q&A :- I/ IV

Hi jlr, I've already tried both calling conventions. I suppose they did something more than only calling the DLL function from within the LIB file :sigh: Undecorating the C++ functions also didn't help... I hoped that there could be some way I didn't hear of until now to find out the parameters, but it seems as if there is nothing to do the trick. At the moment a colleague of mine is trying to find out who (in person) was the original creator of the library. Perhaps we can find it out by this way. :rolleyes: Once again thanks! Reinhard