OLE to Lotus123

Golly how do you find out the answer to this one?

I've embedded a Lotus worksheet into a container on my form, and using FORMS_OLE.GET_INTERFACE_POINTER I've connected to the object handle, so now I should be able to send commands directly to Lotus using OLE2.INVOKE. But what is the format of the command? And how do I know whether to use OLE2.INVOKE_NUM or OLE2.INVOKE_CHAR instead? The Lotus macro equivilant of what I am trying to do is:

        {FILE-IMPORT "TEXT";"C:\WINDOWS\SOLARIS.PRN";"WINDOWS"}

-- 
Richard A. Menard, Consultant
Rambyte, Ltd.
Framingham,  Mass. 01701
voice:   508-872-9551    fax:  508-620-6901
web  http://www.rambyte.com