Play from an Export plugin?

Hi,
From a complete novice at Photoshop plugins...
I am wondering if there is any underlying reason why I can't call sPSActionControl->Play() from an Import or Export plugin.
I have a very simple import and export plugin pair to port from Windows to Mac, and both call a third Listener plugin to keep track of open images. The Windows code creates a hidden window (HWND) in the Listener and messages that from Import and Export. I was thinking that I could replace this by calling Play to send a custom event to the Listener, but can't get it to work.
In fact any call to sPSActionControl fails. [The actual failure is sSPBasic->AcquireSuite in PIUSuites.h returns error 'Parm' when called for the sPSActionControl suite. sSPBasic has been set up, looks ok and sSPBasic->AcquireSuite works when called for sPSActionDescriptor suite].
As a test (to remove other sources of error), I pasted the following lines into the PluginMain function of the History plugin in the SDK sample code and this fails in the same way:
// TEMP code to test use of SPActionControl.
SPErr error = kSPNoError;
DescriptorTypeID typeID;
error = sPSActionControl->StringIDToTypeID("Save Prestige Image dictionary", &typeID);
So I'm wondering (a) is there some underlying reason why this doesn't work, or (b) is there some extra bit of initialisation or setup I need to do before calling sPSActionControl functions?
Tearing out what little hair I have left!! Any help or suggestions most welcome.
Thanks
Terry Smyth
PS Is there another way (apart from Play) to communicate from one plugin to another?

Yes, there are many reasons.
But the biggest reason is that it's an export plugin, and not an automation plugin.

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