How to stop running script??

I'm curious what is the purpose of one script stopping another? Can you explain a bit?

JS, VBS, AS?

In General: you can stop a running script between statements. You can't stop a script while it's waiting for InDesign after giving a e.g. print-command, until the printing is done.

The Running script is probably a loop?

In each loop cycle it has to check (maybe several time) if the condition to Stop is there. If it is, it has to reset the condition and satop.

Apparently there are no Global Variables that scripts can share. You can use e.g. app.label.

I know of a solution that uses smal a disk file, named "stopnameofrunningscript". If the file is created, the script deletes it and quits.

Make sure that the script gives other scripts and apps enough time to do their thing, otherwise it takes ages before the other script can change the condition (e.g. interact with the user if that is desired).