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Hello, everyone. I am just starting to use Labview and programme with Window Message. I'd like to write a VI which can receive WM_USER sent by another software. So I download a library: Windows Message Queue and a DLL file: Windows Messages for LabVIEW. If WM is something like WM_LBUTTONDOWN, the VI works. However, I still cannot receive WM from 3rd party software, though I can see the WM using Microsoft Spy++. Then I modify the subVI in the library - Create Windows Message Queue.vi as follows: give the name of the 3rd party software to the "VI Name" in the front panel. But the VI find undefined errors when I run it. Thanks for your help! windows_messaging_que.zip Communication Test.vi