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... via SendMessage or using another technique.

Imagine I have started 5 instances of application A, then when I am working in application B and press there space, I would like to send this space key input also at the same time to all the other 5 instances of A.

Any suggestions? From which aspects of application A would this depend on? Is it possible to create a solution which would work with any kind of application A where you are allowed to run 5 instances simultaneously?

try searching the forums for the term "multiboxing". The typical method to do as you describe is with ControlSend. Getting handles to multiple instances of a window with the same name is just a matter of WinGet,, List,.

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Thanks my friend, it worked greatly.