How to find application running by HWND?

Question

I have a password keeper app which states that a certain other application is monitoring my clipboard. The password app only states the following as the application it is warning about:

HWND: 855900

How can I find which application it is?

Answer 1

You can use the WinSpy++ utility (or Microsoft's Spy++ if you have Visual Studio) to enumerate all the windows with their handles.

Spy for Visual Studio 2013 can be found in the following path:

C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\spyxx.exe

Then, under Search/Find Window menu, you can search by handle.