You may be right. In that article I see that SendMessage is used. I also found an article that suggests PostMessage, rather than SendMessage. It is Delphi code: http://www.undu.com/Articles/990427c.html

I wonder if anyone is prepared to write some equivalent vfp-code.

>You can use Atoms to exchange data but you've to use some other way for inter applications communications. The DDE uses WIndows Messaging, for example. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/DataExchange/DynamicDataExchange/UsingDynamicDataExchange.asp?frame=true
>
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>>In my search for a method that lets two apps (one is vfp, the other a delphi exe) share some information in memory, I found out that MS offers us global 'atoms'. And I found only one message here on the UT that deals with it. No one has taken notice of what this writer - Mike Gagnon - tried to learn us. Here's the link:
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>>Re: Prevent same program to be open multiple times on a syst Thread #923397 Message #923403
>>
>>This MS link is also of importance:
>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/DataExchange/Atoms/AtomReference/AtomFunctions/GlobalDeleteAtom.asp
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>>I have been playing around with the atom functions. In one vfp app I added the atom, in another (vfp) app I successfully used the other functions, either by having available nAtom, or by using the atom name (cString).
><snip>
>>The potential is - I hope - that it can be used as a memory based alternative for info exchange, which most of us now do with the help of a file.
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>>However, I don't get the picture on how to do this. I can create an 'atom name' and retrieve an 'atom'. Furthermore, knowing the atom (better say 'atom number'?) I can retrieve the name. Knowing the name I can retrieve the number. And I can delete the atom name and number. But that's not enough, I fear.
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>>Who has an idea on how to manipulate these functions in order to let two apps communicate information?