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How to set active application?

How I can change active application using API?
For example, to set my programm active.
Or to set other application active if I have it's HINSTANCE.
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1 Solution
Use FindWindow() to get the program's handle and pass it on to SwitchToHandle().
I have Delphi code for it if you need it.
mukAuthor Commented:
What is a function SwitchToHandle()? Its not API. Have you a sample code?
I'm sorry muk, I meant SetForegroundWindow (it is API) instead of SwitchToHandle:  

//bring delphi app to front:

you can still use FindWindow to get the window handle of another application.

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