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#2  

You could set a variable at the start of the watching script, and then reset the variable at the end of the dependent script. This would allow you to wait for change of the variable from the watching script and then continue after the variable has changed.

#3  

Thanks @rgordon. I knew there was a post like this hidden somewhere... And thanks also @Cochran. I see that you had the same idea, so it confirms that it is the good way to go.