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This is just a little helpful script, that I started using a month or so ago (one program so far), with this version having a Restore ability added (so now using with two programs of mine, as of tonight). You can find other alternatives or similar scripts here, the most recent being - _SingleScript guinness also has something much more elaborate, that is well worth checking out - _SingletonHWID. Just place the following at the beginning of your script, and adjust where needed and wanted (including Scriptname, variable names and MsgBox magic numbers, etc). Perhaps you should read and use the following - Best coding practices ... unlike my slack hobby programmer self (not always). #include <Misc.au3> Global $ans, $exe, $handle, $pid, $script, $Scriptname, $status, $w, $wins ; Assign the program name (window title). $Scriptname = "Update Mp3 Artwork v7.9 (updated December 2015)" ; The following line both sets the unique ID of the current program, plus queries if a program with the same ID is running already. $status = _Singleton("update-mp3artwork-thsaint", 1) If $status = 0 Then ; A program with the same ID is already running. ; Assign a PID for previous script, based on current executable name, whether current script is compiled or not, and assign the executable name. If @Compiled = 1 Then $pid = ProcessExists(@ScriptName) $exe = @ScriptName Else $pid = ProcessExists("AutoIt3.exe") $exe = "AutoIt3.exe" EndIf ; Assign a PID for current script. $script = @AutoItPID ; $ans = MsgBox(262177, "Close Running Instance Query", _ "'Update Mp3 Artwork' program is already running." & @LF & @LF & _ "Do you want to close it for another instance?" & @LF & @LF & _ "NOTE - If all work has been saved, and you are" & @LF & _ "trying to work on another album, then a click on" & @LF & _ "OK is recommended, else just click CANCEL, to" & @LF & _ "attempt a restore or re-activate of original." & @LF & @LF & _ $pid & " (" & $exe & ") " & $script & @LF & @LF & _ "(will default to CANCEL in 30 seconds)", 30) If $ans = 1 Then ; Attempt to close original instance, and continue with new. If $pid <> $script Then ProcessClose($pid) Else MsgBox(262192, "Close Error", "OK process failed!", 0) Exit EndIf ElseIf $ans = 2 Or $ans = -1 Then ; Attempt to retore and activate a non-active or minimized window. ; Get a list of all running programs with the same name. $wins = WinList($Scriptname, "") ; Loop through found instances and compare PID's, restoring or re-activating any match. For $w = 1 to $wins[0][0] $handle = $wins[$w][1] If WinGetProcess($handle, "") = $pid Then WinSetState($handle, "", @SW_RESTORE) WinActivate($handle, "") ExitLoop EndIf Next Exit EndIf EndIf Enjoy! P.S. I have a couple of programs that I regularly forget are minimized while working with another related one, so this saves me some mucking around to close and restart or restore etc. Pretty basic, but does the job well so far.