#include <GUIConstantsEx.au3>

GUICreate("", 200, 100)
$bt1 = GUICtrlCreateButton("Start", 10,10,80,20)
$bt2 = GUICtrlCreateButton("Abort", 100,10,80,20)

GUISetState()
GUICtrlSetOnEvent($bt2, "abort")
main()

Func main()
	Opt("GUIOnEventMode", 0)
	While 1
		Switch GUIGetMsg()
			Case $bt1
				Opt("GUIOnEventMode", 1)
				endless()
			Case $bt2
				abort()
			Case $GUI_EVENT_CLOSE
				Exit
		EndSwitch
	WEnd
EndFunc
Func endless()
	While 1
		Sleep(500)
		ConsoleWrite("just to see" & Random(0,9,1) & @CRLF)
	WEnd
EndFunc
Func abort()
	main()
EndFunc