Firstly, Aggregator is NOT for creating multi-SCORMs and is not compatible with LMSs. If you need to be using an LMS then you should be using the Multi-SCORM Packager tool that comes with Captivate, not Aggregator.
If you publish as SCORMs on an LMS then it won't matter if multiple users on the same machine access the content as long as each one does so from within their own user profile.