I Have a question. I use C# to send messages for other wondows.
In my example it is windows notepad.exe
So after I found handle of this window I can send WM_CHAR event.
But I need help with other two types of events.
How can I send
1) Some system key like "F5" ?
2) some combination of them? For example Alt + V ?

This is code which use now.

[DllImport("User32.dll")]
public static extern Int32 FindWindow(String lpClassName, String
lpWindowName);

[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern int SendMessage(int hWnd, int msg, int wParam,
int lParam);

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr
childAfter, string className, string windowTitle);

private const int WM_KEYDOWN = 256;

For Alt=V, use the WM_SYSKEYDOWN followed by WM_SYSKEYUP window message.
For F5, use WM_KEYDOWN followed by WM_KEYUP

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