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Drag and drop between multiple instances of an executable

I want to know if there is a special way (not using Windows API) to drag and drop data between multiple instances of a same executable. 

 

I have an application built in LabVIEW, where the main window can open a child window. Each window has a plot control. Between the two windows, a plot data of main window can be copied by drag and drop. 

 

And I open another instance of the same executable. Now there are two executables(A and B).

 

I want to drag and drop a plot data from the main window of B to the child window of A. But in this case, Drag Enter Event is not fired. I think that the event seems to be fired only inside an executable.

 

http://digital.ni.com/public.nsf/allkb/AB268878693EF4B586257037004A6725 says that Queue or Semaphore is working only inside an executable. Is drag operation also valid only inside a process?

 

 

 

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