[AHK] Send text to multiple open windows (e.g. Notepad)

send-to-multi-window.ahk

; Press `Ctrl + b` to start
^b::
InputBox, UserInput, Command, Enter a command.
if ErrorLevel
{
	MsgBox, CANCEL was pressed.
}
else
{
	; Find windows containing 'Notepad' anywhere.
	SetTitleMatchMode, 2
    WinGet, myList, list, Notepad

	; Loop through all windows
	Loop, %myList%
	{
		; Send the input & return to the window
		WinGet MMX, MinMax, % "ahk_id" myList%a_index%

		; Only run on windows that are visible
		IfNotEqual MMX, -1
		{
			; Add a delay to the keys to prevent uppercase/lowercase issues
			SetKeyDelay,,10

			; Send the keystrokes to the window
			ControlSend,, %UserInput%{return}, % "ahk_id" myList%a_index%
		}
	}
}