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[stuka]

.

Edited August 24, 2009 by stuka

[poisonkiller]

#include "Misc.au3"
If _Singleton(@ScriptName, 1) = 0 Then
    Exit
EndIf

[qazwsx]

you put that at the top of your script.

[poisonkiller]

#include <Misc.au3> ;includes Misc.au3 from C:/Program Files/AutoIt3/Include
If _Singleton(@ScriptName, 1) = 0 Then ;if another program with the same name as your program exists then this program exits.
Exit ;Exit program.
EndIf
Sleep(10000) ;Sleep 10 seconds so you can run this program again to test _Singleton function.
;Just put first 4 lines of this script on top of your another program.
;You don't have to change anything with your script name, @ScriptName takes care of that.
;To test this script just compile it and run it twice, only 1 AutoIt icon should remain in tray.