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Let start with some examples: 1. (As seen in another topic: '?do=embed' frameborder='0' data-embedContent>> ). Script copied from that topic Interrupt function can be any hotkey/event/adlib/callback. If-check inside interrupted function/script ; HotKeySet, or any function that can cause script interrupt HotKeySet("{Delete}", "RemoveSelectedControl") ;... Dim $InfoAboutControls[4096] Global $HandleForCurrentControl ;... While 1 $msg = GuiGetMsg() ;.... ;---Code to process moving a control (drag-n-drop)--- ; If check in MAIN LOOP (interruptible function). If $HandleForCurrentControl > 0 Then;Make sure we have a valid control handle ; ***** oops user pressed Delete key and we get pre-empted ; ***** user removed the selected control. ; ***** Returning from the RemoveSelectedControl function and resuming here: GuiCtrlSetPos($InfoAboutControls[$HandleForCurrentControl], $newLeftPosition, $newTopPosition) EndIf WEnd Func RemoveSelectedControl() $HandleForCurrentControl = -1 EndFunc 2. If-check inside interrupt function Hotkey only. Flag is set right after if check. It's possible or not this function print twice or more? HotKeySet("{Delete}", "_TestHotkey") Func _TestHotkey() Static $bFlag = True If ($bFlag) Then ; ***** Right here, user pressed Delete key ; ***** bFlag is currently not set ; ***** And the script will execute this function twice or more times, instead of just once $bFlag = False ConsoleWrite("This should be printed only ONCE") EndIf EndFunc 3. Same as 2, but with global flag The question is: can I rely on if-checking with a flag, to ensure that my script doesn't do any strange things, as describe in the above examples?