I dont know what you want to do with the trigger, bit what you could do is have the trigger run a script
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In the trigger
On Activation: [this] exec "myscript.sqs"
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In your init.sqs type the following line
count= 0
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;;"myscript.sqs"
count = count+1
?(count==2) goto "Donetwice"
goto "End"
#Donetwice
(Enter the command lines you wish to happen when the trigger is activated on the second time)
#End
Exit