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Group: Administrators
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Re. #1: No, there is no way to positively, absolutely prevent this. The reason is this: Inquisit Web experiments aren't interactive web pages (think: online survey platform) driven by an underlying central database where all responses etc. go. Inquisit Web scripts are effectively executed locally on the client machine (to ensure maximum precision and performance w/ respect to stimulus and response timing) virtually as if they were executed using a local Inquisit Lab installation -- the browser is merely the channel used to deliver the core Inquisit "engine" and the experimental materials (scripts, stimulus files) to the client computer. As such, an Inquisit script running on a client machine cannot "know" things like "How many other people have already participated in the study?", "Has this subject identifier already been used before? How often?" etc.
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