Okay so firstly, you should use an eVar to capture a unique id for the
user. If your site already has a unique id for a given user, you can use
that. Alternatively, if you have marketing cloud id service implemented,
or have a 1st party cookie implementation, you can grab the Adobe
Analytics visitor id and push it to an eVar. Having said that, I
recommend NOT doing this. Web analytics tools aren't generally focused
on keeping track of visitors on an individual visitor level. Instead,
data is agg...